"What are you even talking about? A fatal attack will always prove more powerful than a non-fatal attack. I'm stating that if a non-lethal attack can destroy the potaras then it is plausible for someone that scales to around Vegito's level to bust the potaras with an attack."
An attack that overpowers you doesn't need to be fatal. Since Kefla was overwhelmed, as you said, that means that Goku's AP overpowered the Ki Defense of Kefla which would include leaving the Potara Earrings vulnerable. All that means is that Kefla's natural Dura > Potara Dura. Both doesn't matter if her Ki is up and protects everything in general.
Also, what? So because someone is more powerful than you and can therefore overpower you, it's a weakness of the item?
Because I use a sword and someone stronger can take the sword from me, the sword's weakness is that it can be taken? That's legitimately what you're saying.
"Gogeta and Vegito are officially equivalent, so I'm not making an argument of someone weaker exploiting the potaras but someone equivalent. And, as I already stated, the attack that destroyed the potaras was not fatal ergo the potaras can be destroyed by non-lethal attacks of sufficient force."
Firstly, where was it ever said that they're officially equivalent? As far as canon is concerned, everything about Potara in Z still stands besides the time limit retcon which the Supreme Kais wouldn't have known about since that's likely their first instance of Mortals fusing.
But Goku wasn't an equivalent. Kefla shot a Ki Blast with all her might after using a large amount of energy, Goku bypassed that and blasted her while she's invested her Ki elsewhere. At that moment in time, they weren't equals. At all. And Vegito vs Fusion Zamasu just hurts this argument further since Vegito was basically dominating Zamasu at moments in time and yet nothing came of the Potara.
That is honestly pretty terrible reasoning when a massive plot point in that Arc is how resilient and powerful Saiyans are. That's more of a resilience/durability feat for Kefla, not a "real" weakness of the Potara. You pointing out how it's non-lethal or fatal over and over isn't going to stop the fact that just because it wasn't fatal, it doesn't suddenly make the fact that she was being overpowered and overwhelmed at that time disappear. It took her both her using a massive amount of Ki, being caught off-guard, and blasted by someone who was clearly stated to be getting stronger at every moment for the Potaras to break.
I also never disagreed that an attack of sufficient force can break the Potara. However you asserting that it being non-fatal, anything fatal would break it. Even though at that point, an attack that's fatal enough to break the Potara would... y'know... be fatal to the fusion anyways? My weakness is that I can take damage.
"Fusion Zamasu was immortal."
Half Immortal.
"That's the only real reason he could contend with Vegito for longer than a few hits."
Fusion Zamasu was overwhelmed but he was still able to contend. Vegito didn't curbstomp him into oblivion ala Jiren vs Z Fighters. If Zamasu was that much weaker, all the more reason to go for the Potara.
"I also don't see why your argument makes any sense, regarding him being a prodigy Kai, when Elder Kai had clear ignorance of the Potara's actual mechanics with mortals and the simple fact that mortals using potaras is something we have no evidence of occurring outside of Vegito and Kefla."
...? Now I don't get your argument. Elder Kai had ignorance over Potara's mechanics with Mortals because no mortals fused at that point prior, hell Mortals were looked down upon until Goku and Co came along. Why wouldn't he be ignorant about something that had literally never happened prior? The fact that he was ignorant about this one thing that never occured before and was never brought up... ever in the past doesn't change the fact that if the Potaras were destroyed, Elder Kai and the others should've known about it seeing as that'd be one of the only weaknesses of Fusion besides the Time Limit (Or lackthereof).
Also if destroying the Potara would undo the fusion, why didn't they do that for Kibito Kai? It's not like they couldn't get another set since it's an item from the occupation. They had to go out of their way and get a Wish Dragon to undo the fusion.
"Yeah, that's my exact argument. Zamasu has infinite stamina due to his immortality, so his Ki doesn't decrease with the wounds he has or how he expends his Ki. This means that Zamasu's durability is, obviously, limitless."
First of all, NLF. Just because he has infinite storage doesn't mean he can field all that energy at once.
Second of all, he was only half-immortal and obviously got more distorted and weaker as he went on (With the purply bits getting more violently sloshy near the end).
Example would be, just because I have over a billion bullets in storage doesn't mean I can fire off that many bullets at once from my 9mm Pistol. Like any other fighter or gunner, I'd still be limited by my firerates until I get a better gun (Or in Zamasu's case, train) to achieve more firepower and firerates. Vegito simply overpowered my 9mm Pistol with a gatling gun with only 800 bullets. Sure I have higher storage and more bullets but that doesn't change the fact that I'm completely out of my league here and that he has more firepower at the moment.
"I extend the concept of 'durability' to the clothing of the characters. After all, weaker characters rarely ever damage the clothing of someone stronger but someone stronger will always tear apart what a weaker (or equivalent) opponent is wearing. So, I am essentially claiming that Zamasu's potaras didn't break due to his own Ki managing to protect them."
If I recall correctly, Kefla's clothes weren't wrecked either. So are you asserting that Kefla's Clothes > Potara Earrings in durability? I mean, I agree that a DB's character's durability would extend to clothing (Or else everyone would be naked in every battle ever), but it's not a constant across all battles.