If you don't like the rule, don't go to the game, simple as that lol
I've been to plenty of max ammo limited games, but it used to be just the WW2 and vietnam games way back years ago in Mb that had mag limits. For realism everyone was limited to semi-auto and 24 rounds per mag, LMG's had 200 rounds in the box.
And no highcaps, no exceptions. So if you didn't agree with the rule, just don't go to the game lol