Every good player? 
I thought i was the odd one here for using it for me for the sake of efficiency and to save on button space. I didn’t think good players actually does this. Where did you get that info?
Correction; it’s woefully inaccurate.
I know it sounds like i’m crapping on the controller here, but as somebody who was a console gamer more then i was a PC gamer (or controller user then M+K user), going from auto-aiming and trying to spend seconds (which might not be long but it all adds up) to manually place your aim on things to using the mouse with no flat objective maximum or minimum or deadzone of sorts makes a world of difference.
The only real advantage that comes to mind i would see the controller be best in is racing games, where it’s optimal to have more to choose from then just either fully 100% committing to a direction or not. Half turns, half steers, precise turning and all that.