The main reason the roulette is annoying is that SE basically implemented Alliance Roulette to force people into the older content, because there are people that haven't seen crystal tower or the original alliance dungeons that got released years ago. I do think they need to break up the roulette like they did with dungeons, just right now it's probably only doable in two layers and they only have one new alliance raid out right now. Once they get one more roulette target they will probably break up the alliance roulette.