Why do so many mmorpg games start off normally, then over time just become overly simplified?

It feels like so many mmorpgs are great on release with some bugs, but the core of the game is compelling and interesting, it sucks you in, then over time the developers decide to completely simplify the game as much as possible, and I don't understand why? Are we considered so stupid that we can't handle complex game play and core features of video games? Or do people just not have the patience for complexity any more? I just don't understand it. League of Legends is pretty much the same thing now. It felt much more diverse, but over time, interesting things were gutted and you're left with things that are as simple they come and people enjoy that?
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