Just ask yourself, how often do I win a hard fight when someone in the party is new?
For me usually they die way too much for any good attempts and the party ends up disbanding.

Other mmos don't have this issue as much because the mechanics aren't unforgiving as FFXIV where it feels like you must know every single step in advance to succeed.

It's a complete waste of time when you are in a fight for an hour and yet never get out of the early phases.