My dude, what are you talking about? If I spam steal on defense I get burnt. If It's a passing lane I dive 12 feet towards the pass. If someone is in front of me and I arbitrarily reach, they are gone.
If I spam block it usually results in a basket unless the guy on offense is trying to do something he has no room to do.
If anything this current system punishes poor defense because just spamming a button as a method of defense results in getting torched.
Saying people "Fly everywherr, fall, and lose the ball" sounds like you might be trying some stuff without proper spacing. You have to be careful with your dribbles because the ball is more live after patch 3, and you no longer a lot of situations where it goes through a guy's leg. The biggest adjustment for me was realizing my previous moves relied on the game bail outs vs. Actually creating space to get by a defender.
As for blocking: If a guy goes up and you go ip into them with the wrong contextual animation and lose the ball, that's bad feels man, I agree. I almost never see the ball lost other than that particular thing, unless they got stripped. If you're getting stripped you have to figure out who's doing it and exploit it.
Is it your mark? Post up->fade away. Is it help D? Burn them with a pass, keep them honest