In the end the purpose of this roulette was to help people finish the dungeons they need and to encourage players past that point to do it again so others can finish. If it was removed it'd make completing the main story more difficult for new players and unless you are incredibly selfish I don't think anyone really wants that. There are dungeons people don't like to get from it but you just get on with it. The levelling roulette was not designed with just people levelling other classes from their main in mind it was designed for new players to get a boost in DF by increasing the pool of players available to do levelling side quest and story mode dungeons.