Current FFXIV encounters are what I call WoW-type encounters.
"Classes" have a limited set of abilities.

Most of the challenge is "going through the motions". Downside is if you have bad ping ... well, you might as well not play.
The alternative is what I perceive as the old-school-FF-type encounters.
"Classes" can cross-class actions - sometimes everything.

Most of the challenge is configuring your character(s) to handle the bosses where some of the more hardcore bosses are just plain unfair - you pretty much have to configure your skill set around cheesing their abilities, even then the boss is still a PITA.

E.g. FFX and it's Dark Aeon encounters - from what I watch on Youtube; I have played it but never hardcore.
I wonder if there is a place for both in FFXIV. It would give something for Classes to do. For Jobs, might as well remove the ability to cross-class; it's not like you have much choice in skills anyway.