As others have mentioned, those cutscenes were made unskippable for a reason. Too many sprouts were feeling forced to skip the cutscenes just to be able to join in on the fights, because of the mentality of "gotta go fast, who cares if someone else's experience is ruined". Be glad that it's only that one roulette, and that anything that actually has story elements in a cutscene - whether it be side content or not - you are still able to skip. One day, if there are enough complaints about it, they could potentially make it so that all those cutscenes can't be skipped as well.

If you don't like having to sit through those scenes, then don't do the 100% optional roulette. If they changed it, the EXP would be nerfed to, quite likely, 30% of what it currently is. Tomestones would probably be cut down as well.