The reason Curry doesn't shoot from 30 more than once or twice in a game is because that's a shot that's only worth shooting if you're wide, wide open (I'm talking no defender within 15 feet), shooting from a complete standstill with enough time and space to measure the shot (which doesn't happen often because he brings the ball up, and he's not gonna catch it from 30 feet when he's working off the ball), or ridiculously hot/in rhythm.
So basically, you should have to either be open or really hot, and also get a near-perfect release, and even THEN, it shouldn't be anywhere near guaranteed. If a shot from 30 feet is even semi-contested, you don't make it unless you get a perfect (or at least there should be a very very low chance of making it without a perfect release). Against a great wing defender with a high "Shot Contest" rating and/or a Perimeter Lockdown badge, it should be almost impossible. And if somebody can get 10 perfect releases from 30 feet in one game, you should just send them a "GG" and take the L. Kinda like if you picked up 2K16 now and Curry hit 10 contested fadeaway threes (right on the line) over you-- that's essentially the same degree of difficulty as a semi-contested 30-footer, I think.
Basically, I guess what I'm saying is that Curry should be able to make crazy difficult threes, but the defender should also be rewarded greatly for even semi-contesting a 30-footer. And honestly... who's to say Curry wouldn't shoot upwards of 35% from three if he shot nothing but 30-footers? :-/
All in all, even if all the conditions are optimal, AND you get a perfect release, the shot should have a 50/50 chance of going in at best. Curry going 5/10 from 30 feet in a game in real life? I wouldn't even be surprised.
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