Reckless play isn't really acceptable I agree, but it is down to the player to make the decision every time whether or not they are risking injuring another player. If they think they may collide then it shouldn't be attempted and it is surely a spirit foul if not an actual foul if they do. However this tactic can be used very effectively against against a flat four in the zone where options are limited. Teams which can't be bothered to play proper D and pull out the bullshit flat four could be perhaps be seen to be encouraging this kind of Jump in though...... Roof
