This is misleading. Yes FFXIV has “infinite battle res” but this ignores that it takes a considerable amount of time to get the cast off and mana to do it OR you have 1 of 2 DPS specs that can do it sacrifice their own time/resources to do it and the ressed player comes back debuffed pretty significantly.
FFXIV also likes to throw damage checkpoints on encounters that have strict pass/fail requirements and having debuffed players means you possibly if not even likely won’t reach it. At least with WoW, while your number of available resses is less, at least they come back at full strength.