Jaco is litteraly the best we have and we never see any aliens give a single shit about earth technology,
The only alien to ever see Earth's technology is Jaco and Vegeta. Vegeta wouldn't admire technology (but his addiction to gravity training says enough) and Jaco is overly egotistical to acknowledge Earth. You could note Beerus and Whis, but they also wouldn't care even slightly for technology relative to the rest of space.
Humans don't even have space ships
Briefs literally made a ship from scratch.
and Toriyama said Human had pre-Cold saiyan level tech outside of space ship and combat related tech where they are clearly inferior,
Source.
the same saiyans that are considered backwards barbarian by everyone who ever mentionned them even after Cold.
I only recall Frieza's closest men and his family considering saiyans to be backwards and that's primarily due to them being racist as hell.
A Namekian ship centuries out of date by an isolationist species who only traveled to avoid extinction.
An isolationist species that everyone seems to know? To add further, Bulma and Briefs completely repaired and reprogrammed that ship within weeks (they coded it to register English speech, for example) and Doctor Briefs built a vastly superior ship from scratch with quadruple the speed and a gravity machine that goes up to 100x. To add further, his ship can withstand a force 100x the Earth's gravity, easily.
It doesn't matter if the Namekian Ship was from centuries ago. What matters is that Doctor Briefs vastly improved upon its design and invented completely new technology for the ship, within a month or two of studying an ancient ship.
Claiming humans are 'primitive', 'backwards' or otherwise is about as accurate as claiming any 8 year old would outclass Leonardo Da Vinci in terms of knowledge. It's like, yeah that's obvious. But give Leonardo Da Vinci the same resources and modern devices, and he will curbstomp that 8 year old kid.
Nope, we're directly told it's a very high level technique yet fodders aliens know it almost by default.
'high level' doesn't mean 'complex'. High level techniques can be simply extremely draining to utilise, making them incredibly difficult to learn.
Also, Ki Control is literally one of the rarest techniques in canon, and actually relies on...control rather than capacity or magnitude of Ki. Earthlings have mastered it. The only characters in space that have learned to utilise Ki Control to alter their output of Ki is Frieza, Beerus and Whis. Ginyu learned to do it after a decade and a half on Earth.
No, you didn't, you just listed a bunch of stuff by either A : an outlier like Gero and Bulma who were already said to be the only impressive tech on earth
You didn't mention Gero OR Briefs. There are THREE humans that are capable of more advanced tech than anything seen in space. We have no reason to know of any other geniuses, due to their irrelevance to the Z-Fighters or Earth's history of geniuses. We can claim, however, that a human genius is extraordinary in Dragon Ball due to the existence of three such geniuses in a single century.
or B : that never impressed any aliens.
As already explained, those aliens either never saw Earth's tech or wouldn't allow themselves to be impressed due to their characters.
Nothing ever say that, You have outliers humans in the Z fighters in term of power but they fall short of other specie's outliers, just like humans fall short to other species.
What are you even saying here? Yamcha, Krillin, Tien and Roshi are all capable of stomping space's most elite warriors. Raditz was an elite saiyan, yet every human Z-Fighter surpassed him in a single year. Even the most dangerous prisoners in the history of the universe, struggle severely to take down the human Z-Fighters and have been amped by Moro's magic.
The human outliers are, quite literally, capable of curbstomping the outliers of every race except saiyan. And this is raw power, I am arguing about their technical advantages.
No, that's just DNA stuff, nothing else,
Super Saiyan is literally 'just DNA stuff' and humans with a hint of DNA are capable of becoming time patrollers and fighting Mira. Hell, IIRC, the saiyans in XV and XV2 are actually descendants of saiyans and are hybrids yet are easily some of the most overpowered beings in existence, with the base CaC handling SS2 Vegeta before ever learning to go Super Saiyan.
Fact it, human potential is the source of Goten, Trunks, Gohan and every other hybrid's prodigious capabilities.
if anything they are portrayed as inept morons
Have you taken a single look at the average alien? Every species consists of 'inept morons'.
Nope, it's directly said that every human has saiyan DNA now, all from Goku and Vegeta and at no point it's implied that it's their human part that make them strong, everything hammer how it's thanks to Goku and Vegeta's saiyan stuff.
They only have 200 years to crossbreed with the entire human race. The population size is unknown, but seems to be easily in the millions. Are you arguing that Goten and Trunks did the dirty and impregnated like a million women?
It's literally impossible for every human to be crossbred Saiyan DNA. To add further, that DNA is diluted, not to mention the hybrids all utilise their Saiyan DNA better than any full saiyan in the first place.
And the actual fact is, Humans are a joke in term of technology as said by litteraly every aliens that ever commented on it and a technique that made the God of Martial Art shit his pant is litteraly know by fodder slaves soldiers to the point it's not even worth naming.
Is that why Beerus shit himself over Roshi's martial arts skill? Is that why Zamasu was terrified of an Earthling technique? Is that why most of Goku's techniques and skills stem from his Earthling teachers? Is that why Earthlings consistently display superiority over the outliers of every other species, barring saiyans and Frieza? Is that why there are three human geniuses in the span of a single century capable of reverse-engineering space-age technology within weeks of having said technology? is that why humans are the only species to have gravity increasing technology? Is that why humans were capable of inventing Time Travel from scratch?
Practically all of your arguments dumb down to "Yeah but the humans aren't better!" and, yet, humans are on a backwater frontier world with limited contact with aliens. With the little contact they have with said aliens, they have managed to develop space-age technology and have invented more advanced technology (such as capsules and gravity machines).
If humans were to join the galactic community, how long do you think it would take for them to become dominant technologically? I give Capsule Corporation a year. If this is when the RRA is still active with Doctor Gero, I give them four months.
More like give them some saiyan stuff from the strongest saiyan that ever lived and they'll get stronger by continuously tapping into that, to the point of wishing for the SSJ form while never using anything specificaly human.
Bzzt wrong. Goku had Gohan when his power level was in the 300-400 range, complete fodder compared to Raditz. Gohan is a loving, dedicated, husband so I sincerely doubt he was responsible for the crossbreeding. Pan is female, so I doubt she was capable of having thousands of children in a single lifespan.
In reality, it was either a descendant of Pan or someone in the Goten or Trunks line that did the deed. Goten is the son of Goku, who mastered Super Saiyan, and Trunks was conceived a while before Vegeta learned Super Saiyan. Yamoshi is a Super Saiyan God, and we know there is a Super Saiyan who may or may not be Yamoshi. So only Goten would be the descendant of the 'strongest saiyan that ever lived'.
I suppose it could be Bra's lineage, but that would have to be a child or descendant of hers, which is an absolute unknown unless we see them.
If you argued Goten or Bra, perhaps. But those are both hybrids with Goten having objectively more potential than any full saiyan in the history of the world. Future Trunks, who should have the same potential as present Trunks, was literally capable of surpassing SSGSS-level with just Super Saiyan 2 and a ton of pent up anger and Gohan has reached God-level with his hybrid potential.
Hell, Gohan even 'discards' his Saiyan half against Kefla, and chooses to use his 'human side' (whatever that means) for now on and ties with a fused mutant Super Saiyan who should be stronger than a CSSB. Literally every single hybrid is so vastly superior to even the greatest outliers of the Saiyan race that it isn't even funny.
Tien can stunlock Semi-Perfect Cell. Krillin can force Goku into Super Saiyan. Yamcha would stomp Captain Ginyu. Roshi amazes even the Destroyers and Angels with his skill. Goku achieved Ultra Instinct as a result of his Earthling mentors (in the manga), Bulma invented time travel from scratch, Briefs can reverse-engineer any technology from space and invented capsules and Gero's cybernetics laugh at the pathetic, pale, imitations that space has to offer.