[necovek]

While most of what you say correlates, there are other gotchas: moving around a 3pt line leaves a lot more space for defenders to cover, and the real innovation is introducing multiple staggered blocks to open up a 3pt shooter (as a development of pick-and-pop). And moving around an even farther imaginary line at like 40ft from basket and making ~35% of those shots.

So it really is impossible to cover a more than 33% shooter all around the court, and that equates to a better than 50% 2pt shooter.