>>716152093
The only reasonably way to fix the jobs is to go batshit with them with regards to how they interact with existing content and how you can use them to deal with said content (since I assume the following will never change)

1. The fights are in/out/stack/spread/stand in spot
2. The combat can't have RPG mechanics because balancing :(
3. Non savage content is goo goo ga ga retard tier

So then, just give each job a bespoke mechanic(s) to deal with that involves usage of the battle area/AoEs/damage/movement, since that's all that's left
Reaper can mirror their avatar on the other side of the target to fight in unison; it can die so you have to move around to keep it alive, they can place a permanent portal to teleport to at any time too
MCH can spawn a dummy robot to place to act as a stand in spot mechanic body, and each tool has a bespoke usage condition: chainsaw is channeled but can move, drill is a gap closer, bio blaster fills a gauge that when full procs poison on the target, so you want to pepper it in between CDs to keep it topped
SAM gets counters/counter stances like BLU, and they get a skillchain like system
DRG jump is invincible and works like PVP but not easy to get/use + extra range on all attacks because lance
DNC en avants are infinite (why not) and has a tango stance where they have to react somehow to their partner's abilities

And no, uptime won't be guaranteed but the game shouldn't be balanced around perfect play, so a good team with good strats can demolish fights in record time
That's my cope, at least; emphasize movement and positioning since that's all that's left