There are few 'solos' that would actually be pieced together, crafted in the real world like the ones created by BIAB. PG has created a method by which this works pretty well as a bonafide musicians/songwriter 'support' tool and IMO has done some very creative and groundbreaking audio bending with BIAB.
Absolutely true! It is very rare that one can generate a satisfactory solo in a single take. I always generate 3 to 5+ tracks and then cut, paste and move things around in my DAW to arrive at something I like.
That said, being able to make my own 'Real Tracks' is reason enough, by itself, to upgrade.