Agreed. When Marcus takes good squared up shots in rhythm and follows through with good form, he shoots a good enough % still. What hurts is that he seems to force shots a bit too much, and in those forced shots, he is closely guarded, drifting left / right, not squared up, double pumping, just not clean looking shots fundamentally. That, and he seems to have a lot fewer chances, and less success, driving and finishing at the rim. He hasn't gotten smaller obviously, but seems not big and strong enough to consistently prevail over the brutal banging that is allowed against him when he drives the lane. Doesn't help that the lane is often clogged, and we don't set enough picks for him and Berry going to the hole, as someone else said.
But to blame his decline in shooting / scoring on whether he plays the 1, 2, or any position number you want to pick, is crazy. Is he getting enough shots? Yes, but more should be driving to the hole. But he gets plenty of chances with the ball in his hands out on the perimeter, where you can think of him as a de facto second point guard if you wish. He can create his own shot or pass to whoever he wants, just like a PG. But I seriously doubt he's saying "man if I were PG I'd be getting more shots, better shots, I'd handle the ball more...... and my shots would go in more if someone called me a 1 guard vs. a 2 guard". That is crazy. The ball and hoop are the same size, either way. You're facing the same defenders too. People aren't going to guard him differently at the 1 vs. the 2.