The styles in the piano room are generally chosen to work well as accompaniment with two handed piano playing. That doesn’t mean many other styles don’t work as well. And you have full access to those anyway, so it makes little difference. It’s just a nice visual short cut, and as you have found, has advantages sometimes, and not other times.
If you never use the styles in the piano room, though, there is not much advantage to it. You can equally well get the piano mode you like - and just as easily - with correct settings, pedal etc, by just creating one or two start up registrations. I have 2 CVPs and both have this as my normal way to select piano. I seldom use piano room.
Mike