The only "romantic" shipping I've done was for Twice but all Once know that they're either joking or Twice members are really gae. That's an inside joke between Twice and Once. It wouldn't really make since for some other groups.
I love friendship ships though. I think it's especially weird to ship in a group where they don't do it as a joke or if they aren't in the same group. In general, I think romantic shipping is really weird with few exceptions (very few exceptions that reasonable)
I love friendship ships as it's cute and lovely, but the romantic ones who go on the idols personal sns is beyond trash.