> Instead of saying "People are not cut to it" why cannot we say "People have not enough experience with it"?

I've been working exclusively remotely for around five years now.

Certainly there are skills that can be acquired and improved that will help you succeed, but I believe that there is also a significant element of "natural aptitude". Some people need the personal interaction of an office environment more than others to feel fulfilled. If they need that and don't get it, no amount of training or experience is going to change that.