Originally Posted by
Selastan
Judging from how it is described, it should indeed be very much a power up. A fighter's attack power stopped being based on muscle strength long ago, now it's down to ki control. Ultra Instinct could theoretically give someone perfect control over their energy, because they don't need to think about it. Whereas before they would have to go through training to better enhance their reserves and control of ki, now it could be possibly limitless, since these things should very well be limited by the mind, similar to how our own muscles can't use their full strength without practice or adrenaline. Ultra Instinct could possibly give access to new ways to use ki as well, possibly even in infinite combinations. If someone could learn a technique through practice, Ultra Instinct might replicate it in certain situations. It wouldn't be unreasonable for UI Goku to use things like Time Skip or even Hakai