Comment by gmueckl
I wonder how relevant Fitt's law is with bigger screens and the drastically changed ratio between mouse hand movement and cursor movement on screen. It used to be that you could reach a screen corner with a very simple flick of the mouse hand wrist. But that doesn't feel the same way anymore on modern hardware.
FWIW, Apple's known to have a slightly more aggressive mouse/trackpoint acceleration curve to account for this. (In retrospect it's probably why Apple went all out on luxuriously large trackpads.)