i think gay relationships in homestuck are very compelling idk, everything listed by op don't really feel like writing flaws at all? like grandpa harley having a bunch of children is bad because...? bro and grandpa do provide a lot of insight on who dirk and jake are as people; dirk having control issues and jake having commitment issues is like, the main reason their relationship doesn't work and they just aren't compatible. i rly fail to see how it's problematic to show how two guys have a relationship that ends up not working, bc like mentioned before in this thread all of the relationships between the main characters end up Not Working in one way or another. that's life!
also the wording "tainted the innocence of their former romance" re:davekat is...? i don't know what to even say about it lmao. davekat's conflict in the epilogues absolutely doesn't come from jade being the evil woman getting in between the yaoiz it comes from both of them being too scared to initiate or commit fully. the whole jadedavekat situation couldve been avoided if they had a spine and told her no we're together and dont want you but they dont bc theyre scared to even commit or initiate something w one another. was dirk stepping in and giving them a push to get together out of line? yeah, but also he didn't really force them it's not like he brainwashed karkat into doing anything he was just making him act on stuff he already wanted to do
theyre both very compelling and nuanced relationships n i think this criticism would make more sense if like homestuck didnt also have other messier relationships, but from the main relationships there's not One we can say isn't "messed up" or doesnt have coercion/manipulation involved