in political speak - we're moving to a consensus there!
every case should be judged on its own merit of course and there could always be a case for a penalty anytime the defender makes contact as the player is getting up.
But on the flip side, what could we realistically expect the defender to do? He has to get out of the way, but he cant physically move away faster than normal movement would allow and if he doesn't deliberately play at the ball, or in the referees opinion, there was no intent to play at the ball, then surely it should be play on, or rather, knock on? I mean he can't move away at the speed of light or sommit, there is going to be some kind of contact from time to time, they are in very close proximity after all and both are moving as fast as they can.
I'd say, if he knocks the ball out deliberately, penalty. But if a carry is loose enough for normal body movement to dislodge a ball, then I don't think we can penalise a defender when really the attacker is at fault. But, yes, I agree, any interference should be penalised straight away.