Same as every MMO. Every noticed how all the top MMOs are ancient? It's sunk cost fallacy, nostalgia and inability to let go. I'm not even criticizing or anything, that's partially the case for me too. At least I still play new single player stuff, so I find my relationship with video gaming is still relatively healthy.

Know some people who play games like LOTRO and such, exclusively as well, who are just... stuck? There's about zero enjoyment they even get out of it. There's hardly any content they have left to do, sometimes legitimately NOTHING left to do. They know every inch of the game, too tired of criticizing legitimate issues that the devs ignore for 10s of years. Log in out of habit. Run around out of habit. Do a crappy seasonal event out of habit for a crappy reward nobody will use, out of habit. Say hi in guild chat out of habit, other people reply out of habit. Log out an hour later out of habit. Some vegetable level gaming.

Applies to all these MMOs and to many of their players. Not to all though. Nothing you can do about it either. Just make sure you're not one of those people and move on.