Part of the issue is the Battlefield flight model, at least in the past, was really shitty. It was an incredibly arcady system where you really can’t travel quickly or be agile. Helicopters in real life can avoid being shot. Helicopters in Battlefield can’t, so they need to survive being shot instead.

There are better games out there that don’t have this issue. Squad helicopters can still take more shots than they should, but they can all be taken down with enough small arms fire (if you hit the right spots). The light helicopters can only take something like 3 5.56 rounds, but they’re really agile and a good pilot doesn’t get shot.