Or maybe I'm unaware of romance novels dealing with game theory and metaethics.
You are right, you probably won't find romance novels dealing with those issues, but that is not something to be surprised or annoyed by.
Each genre has some things that it is, through the tropes of the genre, naturally good at exploring. Science fiction and cyberpunk are really good at speculating about the future (and, of course, by extension, the present: everything is a mirror), because of the setting that they take place in. On the other hand, Romance novels they tend to make good mediators for dealing with different issues, such as sexuality, taboos, class, etc. Just look at Jayne Eyre.
You are right, you probably won't find romance novels dealing with those issues, but that is not something to be surprised or annoyed by.
Each genre has some things that it is, through the tropes of the genre, naturally good at exploring. Science fiction and cyberpunk are really good at speculating about the future (and, of course, by extension, the present: everything is a mirror), because of the setting that they take place in. On the other hand, Romance novels they tend to make good mediators for dealing with different issues, such as sexuality, taboos, class, etc. Just look at Jayne Eyre.