They have a pretty bad track record for saying that something is “temporarily removed” lately, though. Who knows if they’ll actually bring back SL’s Mage Tower during Dragonflight.
That said, it’s not worth quitting the game over. We have no control over whether or not the Mage Tower actually comes back.
It’s why it’s a good idea to try and do content that you want to do when it’s new instead of waiting, because you never know when something will get permanently removed or broken for months or even years because of bugs.
At one point they even said that the Brawler’s Guild would be “temporarily” closed until a patch during Shadowlands and instead they permanently retired the content and moved all its achievements to the Legacy category.
Mage Tower is probably more likely to return than Brawler’s Guild, though.
Oh man, that’s usually how LFR feels, potatoes level of easy.
But in Sanctum, the Hellscream and KT fight were LEAGUES harder to heal in LFR than in heroic prog.
And let’s not even mention N’Zoth LFR, which may legitimately be THE hardest encounter to do in the ENTIRE game, if not for a stacking buff to just overpower it xD
If you’re ever in an LFR where you’ve wiped repeatedly, say something along the lines of “I’m telling you man, 4 or 5 more wipes and we got this.” the people who laugh are on your side, the people who get angry at you are probably the ones wiping the group.