"not enough impact" changes things from objective to subjective.
Intentionally pulling a player's shirt from behind with no intend to play the ball should objectively be a foul regardless, now it's up to the referee to say whether he feels like a foul or not, when where do you draw the line.
Intentionally pulling a player's shirt from behind with no intend to play the ball should objectively be a foul regardless, now it's up to the referee to say whether he feels like a foul or not, when where do you draw the line.