If a hallmark of balance is that slight variations produce shifts in meta, then a stagnant meta is a sign of poor balance. It's fine if there's a different flavour of the month. But when you have the same few jobs dominating the meta for six years and counting, it's probably a sign that they have some exclusive advantages over the rest.

WAR, SCH, and BRD have been a staple of most comps since early ARR, and they picked up NIN and DRG along the way. Even the cast of Shadowbringers have gotten bored of always running their old jobs over this time-frame. Time to change things up.