They can still have problems with false touches while typing on the trackpad especially on modern 15-16" MBPs which have jumbo trackpads.
Commonly on large touchpads, left click is a one-finger tap, while right click is a two-finger tap, either of them taking place anywhere on the surface.
My impression is that dedicated click regions are going out of fashion.
For me that's no inconvenience - I click from the bottom of the touchpad, so I'd be performing an actual click anyway. I guess some people tap near the top?