When I first came to this server, I also advocated for less supports and smaller party sizes, like 7 man parties. In fact one of the threads I made was at least partially responsible for party limit being 5 during the day, it used to be 9 all day. You can easily go find it somewhere, it had something like 20 pages of shit in there.
But it gets to a certain point where if you want to compete, rather than trying to change the system you suit up and just beat the full groups at their own game, because in the end that's what any real competetive player will do . You either quit, or you realize the system wont bend to your needs and you get good and beat them at their own game.
So please stop crying about healers, supports and whatever else. Just fucking get good or quit. Stop whining.