why the crystal tower raids are still part of the roulette?

[Avatre]

This is incorrect as of Endwalker. The Tataru sidequest series does. This is one avenue they can continue down. Make more sidequests do things like the Tataru side quests that go back and visit specific old content so they're required to unlock. There was a huge rush in Void Ark for me in AR right before that step of the series came out because people like Tataru and want to be able to do her sidequest series.

Pretty sure the Tataru quests will continue to add in the requirement for the alliance raids, which considering it in itself is side content, will probably limit the number of "why are these raids required" responses...but there will still be a lot who complain that the quest is locked behind raids.