Until you want to go mobile. Linux on a laptop is still a hit-or-miss experience w.r.t fully functioning power management, wifi without workarounds, and integrated/discrete graphics cards. I know there are perfectly working laptops available out there, but it's still a hassle to track down, find reviews, verify compatibility as stated, then actually install linux since almost nothing ships preinstalled. Then you might want to run QT/GTK/Wx/Tk stuff all side by side on the same machine and that lacks cohesiveness and makes a linux desktop feel very hacked together.

Also, trackpads.