Pct has a heal and a shield on top of addle, Rdm has 2 mits and we know its heal kit, smn has heals in phoenix, lunar and self shield on top of addle, blm has a self shield and addle. That for casters
All melees have second wind (which is buffed) and bloodbath (which is strong in aoe), on top of that sam had third eye and a self heal from there, mnk has a healing buff, nin has a self shield, cant remember drg now, rpr has an aoe regen and idk vpr
Phys ranged has an aoe mit and second wind and on top of that mch has an extra mit and dnc has a strong aoe heal
Tanks have standard tank stuff and on top of that both war and pld can heal in ale and drk and gnb can use their cds as a heal for other people
You can easily run a comp with 1 dps of each role and a tank and kill calca dolls before they are an issue because non healer sustain is at an all time high