It's not difficult just not necessarily fair.
LL has been experimenting with the pitch count in the ER for a couple of years. The LL I am involved with is doing it. The 15/16 yr olds can throw 95 pitches in a game. There is a breakdown for lesser pitches but I don't remember it. The discussion they were having the other day is all the leagues they interleague with uses innings instead of the count so a kid could throw 100 to 150 pitches where the others have to come out after 95.