Been playing RDM, and I say I prefer the new RDM to the ShB iteration. Both are good, but current RDM has a lot more control and flexibility over the previous iteration. You can hold mana now, and there's a lot more ease to prevent drifting Contre Sixte and Fleche. Dying doesn't screw up your Black and White mana immensely without Manafication since Manafication now grants 50 Black and White Mana regardless. Under Lv 50, Acceleration feels weaker because it has less procs, but it feels better the farther you go into leveling RDM. That's a good change in the end for a job's progression. Definitely feels great to play imo.

The job feels very stable and complete. If anything, the only ways I can think of RDM can evolve by next expansion is ... making acceleration be able to proc dualcast, giving Manafication an additional trait to get one charge of both Displacement and Corps-a-Corps, and then upgrading the spells with higher potency/new animations. Moullinet could also get an upgrade the moment you use it, from a conal AoE to a full AoE like Alisaie's AoE melee skill. Maybe acceleration could even upgrade to just activate the finisher spells too. Who knows?

Though I'm not surprised if we see an upgrade to Vercure's potency (staring at Healer's Lv 85 trait Enhanced healing magic and wondering if RDM might get Enhanced Red magic as a trait instead lmao).