@Silwith
well i know the feeling of said party
but then they look at the clock: "crap that took a full half an hour longer than usual"
or the healer/ tank complains: "boahhh im spent, i need a break"
and you end up doing only 1/3 or even only a quarter of the dungeons you used to to with a support and the next time they will get themselves a trusty support
also in gw2 i knew a very skilled thief that was essential in speed runs if someone complained well he only gave them half the stealth/speed buff which would make skipping mobs a drag unless your movement was perfect turning them into focus of the complains
is it childish ? yes very but effective
did it some how change? from my memory dd's were replaceable safe for some outstanding or well connected ones while tank, healer or support/utility were much fewer in number especially once you excluded the unskilled ones