I think saying it's, "5x Harder than the rest." is a bit of a stretch.
All FFXIV's content is able to be done, by any job, as long as those people know how to play their job, understand the mechanics and what their role is in the group, it's going to be fine.
Judging a job purely based on the numbers it provides to a group, and deeming it worthy of being in a static or not, just breeds an unhealthy atmosphere in the game where, unless your playing the, "Meta", you're not going to stand a chance to be part of it, unless you form your own groups.