Basically, IMO, it's this:Xeno Goku Black wrote: ↑Fri Jun 10, 2022 10:45 am But his Ki blasts are drastically more powerful as well so how's that work?
When using UI, Goku's moves get sharper, faster and hit in places where it hurts more, so he can hit beyond his weight class (base can tangle with SS-level opponents, SS can tangle with SS2, etc), but this is limited to physical strikes. We saw that Goku rarely use ki blasts when using UI in lower forms and, when they do, they aren't noted to be more powerful than they should.
The silver UI is a different transformation altogether where, besides granting the full scope of UI, it also increases Goku's ki manyfolds beyond even Blue. The same is true of UI-Sign-, which also functions as an increase in power.
It basically means that only Goku has those special states of being with UI and anyone else wouldn't have them.