I'm admittedly coming to this game a little late. And I've read all the official ad copy that attempts (and fails) to describe this and also read the people who love it but don't ever accomplish explaining why either...
I don't understand the concept. You can choose that you shoot early or late, but not accurate? And then how do you find out if you are frequently early or late and then more importantly by how much? We spent over two decades shooting just fine in basketball games by letting go at the top of our jump and all of a sudden we now need this? Why does this feel like a badly implemented thing pushed through the dev process on the last day before wrapping on the game.
And to make things more, well, confusing, if I shoot with real player %, does this even affect me? (Just to be sure I'm doing it right, with real % you're basically just pressing shoot and ignoring completely when you release, correct? Because it's all about how covered you are and whether you're set properly. Correct? You're not expected to let go at the height, right?