I've never seen a shout requiring REMs eitherYou could say that they should design content that can be beaten without REMs, but the fact is that most of the current stuff in the game CAN be beaten without REMs
I would rather the "unwanted jobs" be improved and be wanted because they're good at something, not because they are specifically designated to be on deck for a particular fight. A few thoughts on issues
DRG- Well, i personally don't see any big issues with DRG, but they keep spending DRG adjustments on tweaking the wyvern in various ways that don't really help anybody. If it doesn't make the wyvern or the DRG actually stronger, it's not really helping much.
PUP- PUP has come a long way but one of the major issues holding it back is nearly unfixable without a major redesign: Job ability delay. PUP has to spam more job abilities than anyone, and this drastically reduce's the jobs DPS if the abilities are used- but not using them ALSO hurts DPS.
DNC: Three words, shared recast timers. Also recast time for flourish 3s is way too long
SMN: Three words, blood pact timer. OH yay, we get to temporarily solve this issue once per hour with a new SP ability! yay!
THF: Has issues but I don't really know much about THF nor how to solve its issues