Why have story's who romanticise this kind of relationship?

I watched it in reverse. And the whole "brother but not" wasn't as weird as it felt when I watched the first ep. However I still think its unnecessary to have that as a storyline and romanticize it. The actors had chemistry, but the force scene was sheeesh. However it was a quick return from that (Eventhough it was only the forcer who saw something wrong, since the forcee didn’t say anything about it. we do not like unwanted kabedon!!). That being said, it's not the worst "brothers, but not, to lovers" I've seen.