This. Generally my mentality is that I'll take a number of matches as support without issue, but then I expect to be able to take a number of runs as something else. A tit for tat mentality, yeah?
Way too often I see people hooking onto one or two Bastions, sprinkled with sinpers and (if I'm lucky) a tank.
Healing's fun, but to me it's not fun enough to be the only thing I do in the game. I want variation, and the CoD mentality (the teamless lone wolf) is too prevalent.
I should start making some friends, I guess :P