Anyway, I'm interested to hear people's thoughts on compatibility.
I have a lot of thoughts on compatibility and *most of them* are not around taste in entertainment. I mean this one is fine to have almost nothing in common. Different music, movies, TV, listen to podcasts or not. I mean, most of that is not necessary and is generally idle time. I wouldn't call it "couch rotting".
That said, it is nice that my wife and I have a good overlap in entertainment tastes.
What matters a lot more in compatibility (and betrayal notwithstanding...) are ethics, view on finances, what brings value, how to raise kids, how to spend time as a family, humor, and sex.
Having different ethics or religious values is very difficult if there isn't much overlap. You and your partner won't agree on what is right or wrong. As such you'll end up being wrong in the other person's view and they'll be wrong in your view. This is extremely wearisome to overcome, and frankly most waywards have shitty ethics on top of porous boundaries. Everyone fails to behave to their ethics at times, but this is a big one.
I think that it's very difficult to maintain a relationship with someone that doesn't spend money the same way as you do, and doesn't plan for the future the same way. What does retirement look like? How much do you spend vs. save? How much for hobbies? How much for experiences? How much for random crap on amazon?
I think your incompatibility on movies is not just around taste in movies, it's about whether or not that experience brings value to you, and it does. For her, maybe it's a hike. Going to the farmer's market. Just being out and about. Sitting in a park people watching. While these are close to the "idle time" things I talked about, they are a little bigger in nature. It's more like how you want to use your free time. Some people are more active and some are more idle.
You need to be a unit as it relates to raising kids. I don't really think this needs much explaining.
In terms of family time, it sort of goes back to free time, but I don't quite think of it the same. Eating dinner together or separately. Who is expected to go to practices/games for extracurriculars? These are some of the topics that can really cause a disconnect because one person might feel more invested in the family than the other.
Mismatched humor, especially around sarcasm, can bring a lot of miscommunication and resentment.
Sexual compatibility is about liking the same sort of sex and frequency (I think it's easier to bridge the gap on frequency than sort). People that like marathon sessions aren't going to get along with people that are in it for the "minutes" time frame. People that like certain kinks are going to want to have that type of sex rather than be denied it.