Ulittles especially don't have the body control, for the most part.
True on both sides of the ball. Seen plenty of clean shoulder barges where the player on the receiving end flops or disproportionately falls off balance... sidelines calling for a foul based on contact and the ‘look’ of the players response. Ref swallowing the whistle being the right call, but parents outraged none-the-less.
Do the sidelines mature along with the players as they age and progress? Haven’t experienced it yet, but I’m hopeful.