Well, a UI requiring less precision to accomondate fingers wouldn't suffer for mouse use.
If anything, it's the contrary: it would become easier to use with the higher precision mouse, because targers would be even larger.
The key insight here is that they wont make the mouse lose precision: instead, they make the targets the mouse has to hit bigger -- which, given that the mouse retains the same precision, makes it even easier to hit them!
It would suffer by loosing data density. I don't want to loose effective screen real estate where it is already limited on a laptop. I try to keep my browser windows as slim as possible for this reason.
If anything, it's the contrary: it would become easier to use with the higher precision mouse, because targers would be even larger.
The key insight here is that they wont make the mouse lose precision: instead, they make the targets the mouse has to hit bigger -- which, given that the mouse retains the same precision, makes it even easier to hit them!