There's something special about these games which keep me playing them. I've tried playing various open world games recently, including several Assassin's Creed games and Avatar, and they just don't grab me. Got the Zero Dawn remaster (After having completed the original PC version when it released), and instantly got addicted. Started replaying Forbidden West after Zero dawn and got addicted again.
I think it's a combination of the story and performances - some of the best characters and companion interactions since Mass Effect - the world building, and the core gameplay loop.
Biggest downside is waiting for the next game to release then another year or so for the PC version before I can see how the story finishes.