I think a pretty solid argument could be made that Homestuck just finds the concept of teen romance gross and spends a lot of time either avoiding the subject or actively mocking it. like, Rosemary is prey to a lot of the exact same "it happened off screen" -isms that Davekat is; we only really think of it as a "real ship" because it has some legacy clout and therefore a couple extra years of fanfic under its belt, but the way it turns out in the Epilogues clearly demonstrates it's not in any way exempt from the story's Relationship Deconstruction Beam.

Mom and Dad are a joke ship. "what if Mom and Dad were in a loving, reproductively-motivated relationship" that is joke nonsense. the Signless and the Disciple I guess count as a healthy relationship if we take Scratch's monologuing completely at face value, but then we see that Kankri and Meulin's teenage relationship is dysfunctional to the point of near-nonexistence, so - again - The Beam strikes everyone eventually!!

there's a whole other corollary argument I could make about how men's coercive tendencies are a core theme in Homestuck and it's rare for a man to be in a relationship with ANYONE, man OR woman, that doesn't involve some unhealthy wielding of power. but I think everything above makes my point known well enough on its own