QoL I would get behind:

1) Cap all old raids at a reasonable iLVL (maybe at whatever gear the raid drops). Ideally to make them all reasonably challenging but more or less a guaranteed clear as long as mechanics are understood and done correctly.
2) All non-current expansion raids give identical rewards in exp, gil and/or tomestones, so it doesn’t matter which one you do in roulette.
3) Minor housekeeping on iconography (eg. Use the actual stack marker on stack mechanics and not the generic orange/blue/purple arrows)
4) Eventually, a story mode version of raids that is identical-ish, but done with NPCs. No rewards other than story.