#FFXIVHEALERSTRIKE

[Evergrey]

The party just instantly dies. You're not even allowed to salvage most encounters.

That's also one thing, a lot of the danger evolves around 1-shot mechanics and if too many fail one there's not enough time to recover from it.
If instead a fight have less 1-shit but more heavy hitting attacks instead.
It's been a while since I played any other MMO on a regular basis so can't really come up with any good comparisons.
But in those the bosses mostly hit more frequently and the fights aren't designed to always be foguth in a more or less stationary position like FFXIV boss arenas.

Regardless, maybe it's not the lack of healers to do during downtimes in a fight that's the major issue, but that the fights themselves are designed in such a way that there aren't much for the healer to do.
Bosses hit in a slow fashion, almost each and every hard hitting ability has a several seconds castbar.
The fights leave little for accidents to happen for healers to heal up.

Before we didn't have stuff like Tankbusters adding a visual marker on a player, and many of the boss's skills weren't marked either.


Edit:

From my own perspective, a tanks self healing is (or should at least) be a "oh, crap" button for when something hits too hard or missed to pop a defensive, giving a healer some time to top them up again.
But since the fights leave so little to accidents, a tank can easily use those "panic" buttons to sustain themselves.