This is gish propaganda. Nothing wrong with two barbs side by side soaking up damage together or two casters taking turns wiping the field from a tall spot.
Everyone could use a healer, though.
Healers aren’t rare. We just roll with each other.
what do I do if I’m a healer
Prepare some side quests to give a potential mate, obviously. Then stand around in a light beam and wait.
ETA:
more viable in the current meta
… the what?
I’m a plate DPS main and I married a healer. There is a lot of pressure to ‘just tank’ for her.
also consider polamory as you want the trifecta and maybe even an extra dps or two.