The ability to change distance of 3-point line, length of shot clock and legality of zone defenses.
I refuse to buy NBA 2K21 because of one thing, THE SHOT METER! It is so disgusting and is so much more difficult to shoot with. Bring back the shot meter from 2K20, it is not too much to ask. The old shot meter ran so smooth and it made every shot satisfying, now it gives me a stomach ache.