Trying to explain to players that getting the ball has no bearing on whether it's a foul is not going to get you anywhere. Everyone "knows" that if you get the ball first it's not a foul. I've seen premier league referees making the 'ball' gesture.
My own rule of thumb is that tackles from behind must be clean but tackles that the attacker can see coming can involve contact after the ball is played (provided it's not reckless or dangerous).
That just isn't right. On that basis you can lunge from the side and as long as you win the ball that is OK, whereas law was updated to specifically reference lunging from the side or front as being offences.
If it is careless or reckless it is an offence, doesn't matter if it wins the ball, or from what direction it comes from, it is still a foul.