Mate, are you a M+'er? yes? Then you are the kind of person who asked for more change in dungeons, thus, you now have a rotating selection, and they switch out dungeons pr. season.
Or are you going to claim that if they made four more dungeons but you still only get 8 in the pool, that they only made 8 dungeons? Since M+ seasons outweigh content, I guess you don't believe in raid tiers? Zone events? New zones?
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The FUCK you on about? Are you so locked in the seasons that because someone isn't in the season means it is unavailable?