Agreed. The game could also use more spots for heal/support.
I prefer tanking or healing over dps'ing. Yet I always have to dps, if I want to run trials. There is usually only 1 spot for tanking. Healing is 1-2 spots, depending on boss.
Also noticing how a lot of guild and premade groups lack dps for trials. While they're overloaded with players crying for a spot as tank or healer. They just cant find enough devoted people interested in playing main dps.
But I guess it's the fundamental design of trials causing this, being dps races. You can't afford extra tank or heal, if you want a a good result. You only need loads and loads of dps, therefore those spots becomes harder to fill.