Genuine question

I know that people hated Looniversity because they made Buster and Babs twins but was it because they liked them as a couple or just that them being siblings took out the "no relation" gag when they would introduce themselves to each other? I never really shipped them and liked them as friends that had that tension but not being an official couple (because I didn't ship anybody back then LOL) so I am curious to know if people liked them as a possible couple and shipped them or them being siblings took the "no relation" gag away.