I don’t picture too many mates that can handle religious extremist conservative misogynist to atheist leftist open minded best intentions diversity ally. I could be wrong. Heck, in that span I’ve gained, dropped, and maintained more weight than anyone I’ve ever dated, going from ~250 to 350 to 187 and racing bicycles. I doubt I would have spent 3-4 hours a day on a bike while working 8-10 hours and racing on the weekend if I had married someone in my early 20’s. I’d probably still be in bad health. I’m not all that bright right now, but I was a whole lot dumber in the past and having someone around that reinforced my biases was certainly a factor in my growth and development. It is hard to say how things would be different. It gets super lonely at times, but my situation is not standard there.
I personally think that shared interests are far less important than shared values (as in equality, for example), and while it’s fun to have a partner who has shared interests I don’t necessarily think it’s a prerequisite. If you enjoy spending time with them and they’re a good person, that’s all that matters if you ask me.