It's a common complaint that's pretty frustrating for both creators and readers (though as GoldenPlume mentioned, it is more efficient for Tapas algorithm).
Though instead of multiple genres, I just think that Tapas could do with expanding their current list. When I first started I was really surprised that Tapas didn't have a Romcom tag, considering how popular and staple that genre has become.
That said, I do think it's up to the creator to make sure that, if your comic deviates a bit from the norm of that genre, you showcase it in either your thumbnail, title or style. Show don't tell, as they say! X'D