You all know the occasional whining and *****ing about the collision model. Just imagine the constant screaming on (unsquelchable) countrychannel if friendly collisions were on. It would be unbearable: "You rammed me - no you - you %&/% son of (/&(/&n " and so on.
Itīs fine for certain special events, with lower numbers, more discipline and (perhaps) less noobs but NOT for the MA