if you want to get loose with the definition of a romantic relationship, then sure, you can argue that relationships can function on one of those needs alone
My argument is still going completely over your head
I'm not arguing the definition of romantic relationship, I'm arguing the definition of needs.
Someone can have different needs than you, and have a relationship that fulfills all of them.
however, the fact remains that its not a healthy relationship.
You're not exactly a good source on what constitutes a "healthy relationship" when you are, by your own admission, not interested in them yourself.
it won't last long, which is what matters
No, what matters is whether all parties are happy in whatever the arrangement is.
If all parties are happy, then there's no reason to say it won't last.
If everyone involved in a relationship is happy, consenting, and no one is hurt, then telling them "your relationship is unhealthy" is nothing more than being judgemental