For me anyways, I don't think there is a point to entering relationships. In my experience, I have yet to experience any kind of romantic (or sexual) attraction to other people, but I used to date anyways because I thought those feelings were just supposed to kick in after a while. It never did, and the day I told myself that I would not enter another relationship unless there was something distinct that I wanted that was unique to a romantic relationship. I haven't entered a romantic relationship since, and I've been pretty happy and generally content.
I think that at the heart of a lot of romantic relationships is a form of emotional intimacy, though I cannot speak from experience. I think now that casual sex has become a lot more acceptable in some scenes, people are less likely to enter a relationship purely for sex, though from what I've been told, some consider sex as one way of expressing love between significant others. I do know some people whose entire relationships are based on having a consistent sexual partner though, which I see no problem with if both people are consenting (and the relationship isn't toxic in some other way). However, sex is also not a necessary part of a romantic relationship for everyone; there are plenty of asexuals out there that are romantically inclined and will either have a non-sexual relationship or compromise concerning sex. Thinking about it, I suppose it varies from person to person, and not everyone really gains a net benefit from romantic relationships in general.