Maybe if PvE was as chaotic as PvP can be.
There's sadly no room for PvP jobs in FFXIV current PvE system. It's too slow and too organized.
PvP feels more impactful and the skills more meaningful because every decision could mean life or death, combat in PvE doesn't.

But if PvE was more chaotic and random as PvP can be the majority of the playerbase would lose their sh*t.