First of all, MMOs don't remove old content. The only time you have time-sensitive content is for events within the expansion that generally have no rewards. In Legion, we had the Demon Lords quest which was only for the expansion. Once legion ended and BFA launched that quest ended and for good reason, a 120 would squash the quest due to being 10 levels higher and way better gear, even if in blues. Oh and that quest gave nothing but a weapon skin. Second, Season of the undying comes with the expansion. After that every other Season is 10 dollars. that means three expansions is 30 dollars. So 10 dollars you get temp content, while for 11.67 you get persistent content. You can fanboy for this as much as you like, it is a raw deal. You are a sucker.