I can understand your confusion, Donny... Concentrate on the vocal, and let the machine do most of it for you is all very well for acts that put the 'entertainer' front and center. To the point, as you have told us many times, where you go out front and let the machine do EVERYTHING. Now, don't get me wrong, it's ONE way of doing a show.

There are others.

There are some of us quite capable of covering three or more parts of playing, while we sing as well! Hence the need to strip out three parts from the accompaniment. I rarely feel comfortable playing if both my hands are not fully utilized. But that's just me. If I had your voice, maybe I'd work it differently. MAYBE if you could play three or four parts while you sing, YOU might feel differently, too.

We all do different acts, yet somehow, we keep working. What works for you is by no means universal. It is simply ONE way of doing it. Whatever 'it' is