Oh, I'm not disagreeing with that point.
In fact, the pressure on PGs is the very reason Roy had to resort to inordinate volumes of work-arounds for those who weren't up to the task. That's smart coaching, albeit making up for deficits in the roster at any given time.
That said, it's also the reason that the legit PGs (like JB, Ray, et al) who didn't need the work-arounds were necessary ingredients to get to the promised land. And, no matter how much some fans wanted it to be otherwise, without those few special guys, we had no chance, and all the set plays on the planet weren't gonna be enough at the end of the day.