That is a nice workaround for now, but in the future having less...hacky ways to have subgenres would be neat. Especially since in my current build I wanna add multiple subgenres per game, ones for mechanics, styles of play such as AR and VR, themes such as Cyberpunk, Fantasy, and etc, and they would show up in all the right subgenres, kinda like now franchises work.
On that same note, if you were to one day add this feature, I assume that tech could be used to also allow us to add sub-franchises, which would help my current build as well
For example:
Batman
Batman: Arkham
Lego Batman
Bioshock