So I just blitzed an alt to 80 recently for some fashion goals, and I couldn't help but notice that specifically the MSQ dungeons "at the level cap" for each expansion seemed to be giving... actually considerable XP.
I recall being surprised that the new duty support level 50 ARR imperial finale dungeons gave proper XP even outside their roulette, and maybe I just missed something or didn't notice before but... is this new? One of my big gripes has been that "capstone dungeons" are only really ever seen once outside their roulettes, and aren't something one visits while leveling alt jobs. Did they change that? I imagine it might be a new thing as of 6.1 but I don't recall hearing about it.