Yoshida has stated that multiple goals in a dungeon would not work because it would cause too much conflict, esp in roulettes, with different people wanting to go different routes. You can already see that in content like HoH with the ppl who are there for exp vs those who are there for chests.

Also, the set up and multiple goals of the dungeons in 1.x nearly everyone hated because it only increased the amount of times you needed to do the same dungeon, it got super old and super stale, super fast, esp the speed run aspect. The only possible way they could do this would be to only make it accessible by pre-formed pts and never touched by roulettes. But if you are going to do that, may as well just make different dungeons so its still playable down the line and more interesting.

I would like open world dungeons like Shposhae and Carpathia Hallow or w/e it was called. But they shouldn't be anything like Diadem or Eureka. Both of those need to never be spoken of again. idk what good aspects you are even talking about as I don't think either really has any...