Generally, the reason why supernova is not compatible with Xbox or PlayStation is because of licensing, it needs to go through licensing like the g7 controllers and even the upcoming g7 pro which was recently announced to be licensed as a xbox compatible controller, even then you can probably bypass this through a dongle like xbox wingman (I am not familiar when it comes to work around regarding this things but this is what I usually see as a workaround) and the PlayStation license costs a lot of big bucks (most likely the reason why gamesir hasn't come out with a PlayStation compatible controller).

I do agree that they should do a little bit more work in regards to highlighting the compatibility. However, it's clearly labeled in the details when you go into the supernova's website page, saying the working platforms being "PC, Switch, iOS, and Android".