Which expansion era of wow was different? Vanilla? No that was Nax or nothing. BC? No that was Sunwell or Nothing, Wrath? ICC or nothing, Cata? DS or nothing, MoP? SoO or nothing, WoD? HFC or nothing, Legion? Antorus or nothing.
It's basically mmo 101, you reach a point where it's the end raid and you're done.
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Every game dev wants you to play the game they made to be played in the way they designed it to be played.