I've always felt as though I'm unable to fully enjoy RPGs. Final Fantasy is one of my favourite series of games, but outside of that it's pretty limited. Undertale was probably the last RPG I played that I liked, mostly because it did something different with the combat system and the puzzle aspects weren't too over the top. I feel the same way about CrossCode, but I would put that game into a different category as it isn't a traditional RPG.
I just don't want to sink a ton of time into a game that is mostly a grind with story elements and payoffs that are few and far between when I could play a different kind of game that is at least continuously stimulating.
I have played all of them but haven't finished any of them. I got stuck in Shovel Knight one day and just kind of forgot about it and never played it again. Cave Story was really cool, but I just sort of stopped playing it as new games came out and I started speedrunning more. Sonic Mania is a masterpiece. The Sonic games have never really interested me that much, to me they were always frustrating and mediocre as a kid, but some of the art and design in that game is fantastic.