Jamie, you have mainly experienced the RC events which due to the nature of the arena only have limited numbers in each fight, which may explain why you have never had any problems.

With the other arenas running feathers is a different game. We want to put on a show at the same time as encourage feather builders. If RR and RL limited the number of feathers per fight, most would only have 1 fight per weekend not 3 or 4 as is usually the case, and only a few feathers looks silly in a large arena. So personally i think limiting the number of robots is counter productive to the hobby for all involved EOs and roboteers. To have a safer environment for roboteers, arena marshals and others is a must, we all accept that what we do has an inherant danger but we must try to reduce the risk.

Switching to 2.4Ghz is the safer option. I would say that most people have now taken the option to switch, at the last RL event Tx control had less than a hand full of fighting robots on 40Mhz.