Exactly.
It's not about keeping the mode "realistic" to what happens in real life parks.
It's about keeping the gameplay balanced.
Three in the key should be enforced in Park to make the gameplay experience better. 7'3" dudes standing under the rim the whole game doesn't make the gameplay better, it makes it worse.
For that same reason, I'd like to see clear path fouls and a team foul bonus being enforced to get rid of the foul spammers. The offense should get 1 free throw plus the ball back on the 5th team foul, and 2 free throws plus the ball back on the 7th team foul. Then people wouldn't be able to auto-foul and reset the play every time you have a fastbreak, a clear path to the basket, or a mismatch in the post.
Moving screen fouls would also severely hurt the zig zag left-right-left-right three point cheesers and would make the gameplay experience better.