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"Also, if an opponent slides into position, he is moving to that position before the player is physically committed to jump."
Not often true. Defenders may be waiting, and just as the
the shooter commits they slide into his path. Again, I think the point here is that the shooter starts his jump to an open space, but before the second foot leaves the ground the defender slides.
"First, you need a clear dividing point, and that is the point they leave the floor. You cannot alter direction when your feet are off the floor..."
Well, often, depending on speed, you cannot alter direction
enough to avoid contact after one foot leaves the floor. Yet the defender can still legally be moving. The point here is that officials are given leeway on screens based on speed, but not a shot.
"People getting screened are concentrating on staying with a player, when a third player comes into play."
More often than not it is a second or third defender that draws a charge on a shooter, not the primary defender. Why is that different than a third party screen? Moreover, at the point the shooter initiates his jump, his attention moves to the rim.
Say what you will, but scores are going down and this is one interpretation that has evolved over the years to favor the defense. You can say the current interpretation is better, but gate receipts (even at the HS level) don't
agree.
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