I disagree with the assessment that an extra 10-100ms doesn’t matter.
How pleasant an app is to use does affect a user’s perception of an app and product even if they can’t articulate it. Fit, finish and polish do matter.
On my first iPad, gestures seemed to actually move the screen like paper. Now you perform the gesture and the screen does it’s animation. It doesn’t feel alive. And the animation gets in the way, because you need to wait for it.
How pleasant an app is to use does affect a user’s perception of an app and product even if they can’t articulate it. Fit, finish and polish do matter.