The ability is, the transformation...not really
Do you mean what UI is or with the things it comes?
Its not as broken Hokuton Shinken which is just bullshit be it from inside fighting or if you wanna play the range game but im sure UI gets more broken with time.
This scaling chain here is neat if we just stick to pure H2H traditional martial arts:
Grand Priest > Whis > UI Goku > Roshis fake UI > OG UI, Grandpa Gohan and Master Roshi
Since you dont find it impressive what Gokus UI showed us, what about Roshis pseudo UI being able - only temporarily - to keep up with Jiren easily blitzed Kaioken Blue Goku? Jirens character in manga is more srs and I do know he wasnt allowed to kill cause it was a tournament, but multiple characters incldung Jiren himself expresses surprise.
Gokus UI scales massive above that.
I mean ... i could see two ways of Toyo handling UI:
The first one: make it super broken the better Goku gets. For example I could see Goku getting a "oh crap button" in a deadly situation where his body connects with the angle realm and thus giving him infinite speed. Speed kills, even more so in stats equal battles.
The second: Just make what Goku is good at better and get good enough at other things that are necessary.
I could see number 2 becoming more true in near future and go the route "Everything could work when the right person is equipped with it" and it fits Goku so damn well.
If we check what Gokus UI unlocked:
UI makes Gokus character more srs
UI makes your body as sturdier as necessary and combine that with KI manipulation = you can eat so much above your weight class
It improves your movements passivley which goes hand in hand with Gokus whole character of getting better and stronger during a fight
Granola whole sthick reading you on a cellular level didnt work
Honestly ...even at this stage Goku is such a monster counter to most pressure point fighters, lol.