Yup, leave it alone. It's entrenched in the game. There's so much of it going on that referees wouldn't stand a chance, and fans would be freaking out for the game stopping at every set piece, and i mean every one. There's subtle fouls going on in aerial challenges on most occasions, players putting their arse in, holding on to a player, putting their weight on them so they can't jump as well. There's loads of stuff going on and it's way too deep to sort out. It would effectively ruin the game if refs blew up on everything. Unless of course we just pick up on set pieces, then fans would moan about all of the other stuff that goes on that isn't penalised.
I'm not bothered by it, couldn't care less really. It is what it is. Football is to far gone. Players are treated like gods, Fans are up in arms if things go against them on radio shows, social media etc, telling usall how much it could cost their club as a consequence of the referee not picking up a foul etc. So, we're all to blame because of the lack of tolerance afforded to officials, TV revenue, big business not wanting the product to look shit etc and fans crying every two minutes when their team is stiffed but say **** all when it goes their way. it's here to stay, and the authorities aren't going to do a thing about it.