In PRACTICE, by the way. That's the disconnect a lot of people are having and not understanding.
In practice you are loose, comfortable, and able to focus 100% on your shot.
In an actual game, and I can tell you this from experience(Shooter in highschool), even if you are wide open you have a myriad of other circumstances. Maybe the guy you're guarding has run you up and down the court. You're tired, your ribs still hurt from getting nailed with a hard screen, Did you leave the oven on?, I'm wide open, is everyone on the other team visible? No one's running out on me. Okay, just like practice. Man my wrist hurts from the foul last play. Etc. Etc.
There's more to shooting that being guarded or open. Anything can disrupt your rhythm. Everything adds to Ever wonder why being hot is sometimes referred to as being "In the zone"? You're literally in your own state of Zen. All you hear is the game, all you see is the game, all you feel is the game. There are no outside stimuli, just focus.
Pyschobabble aside, my point is this: hitting 77 out of 100, or 77 consecutive in practice is amazing. That is almost never going to transfer to an in game scenario. Too many variables in an actual game.
I'm going to repeat a previous post: User timing on releases is skill based to an extent, however, TRUE skill is knowing how to cut, fake, get open and find a good look. Actual basketball skill should trump the ability to know when to let a button go.