It's beyond that. It's the fact that the entire game is designed around challenging players to dodge mechs and align buffs with seven other players. There isn't any room for buildcraft variety or skill expression or situational abilities or job specialties.
I actually think SGE and SMN are totally fine designs if we accept the very heavy limitations the game has set on ALL of the jobs. They are doing far better within FFXIV's dumb DDR no-scrubs paradigm than jobs like AST, DRK, SCH, MCH, DRG, and SAM which lose more and more of their identity over time.