I agree with you that it makes things more subjective, however how well it is being enforced right now?
Players aren't calling foot faults on jump putts and whatnot that are more obvious than stance violations on long holes where the basket might now be in view. Some of that is probably because they're focused on their own game and not somebody else's, some because they don't want to be "that guy", and some because I'm not gonna question you, so you don't quite understand action me.
All I'm saying is let a player line up in the direction they're trying to throw, don't cross that perpendicular line, which is way easier for a card to spot check out than busting out a protractor in the woods when somebody is simply trying to pitch out.
Yes, it probably introduces some gray, but if you see somebody lining up a shot it's pretty obvious where they're going…way less ambiguous than awkward footing lined up through the woods at a target and throwing in a different direction.
Meant to be an exercise in critical thinking. Not saying my description is the best, I'm sure there are faults to it, but that asks a fair investigation of the current rule and the evolution of course design. Worst case the current rule stays put and in 5 years nobody watching dg footage on ESPN (Eagle's Crossing will have launched us into the big time by then) will know any better
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