I said it in another thread, they’re phasing out TW by making no one want to run them so when they remove them they can blame the community and all the little blizz-kins will say “blizzard did nothing wrong they did everything correct, if you wanted them you should have run them” (they’re already in this thread…it’s a known issue but even then blizzard did nothing wrong)
they’re making doubly sure this happens by changing the rotation to barely once a month.
someone somewhere in acti-blizz had the 200 iq movie of “how will people playing classic TBC/WotLK if we let them do the dungeons in retail”