I see most responses here suggest people generally go for new content vs replay.
When I was young, the thought of re-reading a book or re-watching a movie was insane... why waste time on being bored repeating something, when I could have a new experience, new emotions, possibly new insight into something?? But in my mom's later years, she enjoyed re-watching movies, and I think they were comforting to her. She knew the plot and thus didn't have to worry about paying attention and missing something, but could just relax with "old friends".
I find I enjoy replaying a lot for several reasons.
1) the game is already installed. I don't have to waste time researching which version I should play, what patches it needs, what other things I should know, trying to avoid spoilers while researching all this, etc. This might take many hours of "prep" before even installing, and that often puts me off.
2) I know how to play. I don't need to RTFM to learn controls and mechanics, or research which skills or weapons are actually useless or OP. I can just start the game and go.
3) A lot of games disappoint, irritate or even anger me. It's getting to where I almost expect to have a bad time with a game. I want to have fun, but common elements just rub me wrong. As such, I find myself returning to the games that didn't leave me feeling bad or unhappy.
4) Nostalgia also plays a part. Things I enjoyed as a kid I'm more likely to replay, because of the residual happiness I had when I played it decades ago.
EDIT
InSaintMonoxide: I replay pretty much everything fairly often because i tend to find games more enjoyable the second, third, fourth or fifth time of playing through them. The first walkthrough is always the least enjoyable one for me.
This happens a fair bit to me as well. Why is your first experience the least enjoyable?
timppu: I kept thinking "I need to learn yet another trick or feature in the gameplay? Is there no end to this? When do I get to actually play the damn game, without someone constantly holding my hand and telling me what to do?"). It also started to feel they had crammed a bit too many "gameplay features" to the game, trying to make it all feel so much more versatile when there is this and that you can do in the game.
This is for you:
https://www.youtube.com/watch?v=9UuZQyTWiF0&ab_channel=VivaLaDirtLeague