If so, are you prepared to support with evidence an argument that hetero romance and the hetero dating scene is completely identical in all aspects to gay romance and the gay dating scene,

In context I agree with your general point, but this seems like a strong demand for particular proof. To establish the point handoflixue would not need to establish that they are 'completely identical in all aspects' but rather that they have enough similarities for the genders and orientations to not be relevant in this context.

(Incidentally, I'm a het male who agrees that there's been a serious problem of focusing on advice for het males here. The most obvious solution is for the people who aren't in this set to write more general pieces. Or volunteer to work with someone like luke to coauthor a piece that is more broad. There's not some magic rule that luke and a few other people have to write all the posts on this subject.)