Glad to know it’s not just me. Civ and Stellaris both, game progression for me goes like: fun, fun, fun, yeah screw that guy!, fun … getting less fun, definitely not as fun anymore, meh.
I just picked up Cult of the Lamb which is at least silly fun. Bonus points for blasphemy!
I never thought about it like that, but that explains why I played through Borderlands 2 over and over again while doing chemo. Everything hurt but I could still mow down some baddies.