There needs to be a way to remove dungeons from roulette?

[Mahoukenshi]

This. Amaurat especially needs rouletters to help new players finish the MSQ.
I would love to opt out of ARR content in my roulettes since I find most of it dull now but the reality is the roulettes primarily exist to keep old content alive and doing so would hurt queues.

Technically, MSQ players can run Amaurot just as the other msq dungeons with Trusts which makes the whole roulette reliance rather wonky, unless the players specifically prefer to run those dungeons with real people. This is, of course, fair enough, and up to everyone's personal preferenance. In contrast to pre-ShB dungeons where you must rely on other players - no negative connotation intended - to queue for the dungeons (and some "harder"/longer to queue trials).