Do you feel like you HAVE to do every roulette?

It's kind of nice to have the option to do a dungeon I KNOW back and forth rather than thinking I might get "THAT" dungeon (there is always a "that" dungeon for everyone). And yeah "that" dungeon can BE the current expert sure.

But.. why remove an option for some more rewards?

Don't like the expert dungeons? Don't do em.

you really don't have to do every roulette every day. Go Run a few crystal conflict matches. Do some hunts. Maxing out your current tomestones isn't hard to do if you don't do the expert roulette.