The downed state and revive aren’t exactly without consequence. In a lot of occasions actively helping someone in a downed state, puts yourself in great risk of going down as well if done mid-combat.
And the transition from the downed state, towards actual death, comes with repair costs by minimum, and if happening in the open world also with traveling fees.
For players who simply keep on dying and dying, those costs can rise up pretty rapidly. Especially if considering as to how the rewards in dungeons aren’t of as high value as in some other MMO’s you’re wanting to keep a check on your death count to prevent yourself from ending every dungeon run with another 50s loss.