Since a reasonable follow-up question would be about keyboard layouts and styles of shift keys, I will say that I have analyzed my shift key use (in previous shift threads here), and recognized how my fingers tend to work. (Note that I use conventional ANSI almost exclusively.)
I tend to strike the outside edges of the shift keys. For that reason, a short/split Left Shift does not particularly bother me since shift is to the outside, but a short/split Right Shift with shift on the inside drives me crazy.