I have the Master license but pretty much just use the Mac version nowadays, because macOS is my preferred desktop system, followed by Linux (GNOME or Cinnamon, mostly - was using the Linux version when I was between Macs).
Is there any intention of moving the Mac version of JRiver towards Mac / Aqua interface behavior? Basic things, for instance, like adding standard ability to hide program; including the Mac window control buttons (the red, yellow, green ones) and their corresponding actions; and split screen capability? Media Center pretty much looks and behaves as if it's wholly separate from the OS I am using, so I am guessing the answer is no; both the interaction and the responsiveness make JRiver feel like it's being driven by something other than usual Mac graphics coding (I am not a programmer, so pardon non-technical jargon). Windows has never had the standardization and resultant elegance which the Mac experience achieves by all popular third party applications following some basic interface guidelines, so over in Windows (& even more, Linux) the standalone nature of the interface behavior seems normal. (Plus, the application just runs smoother on both those systems, and the Windows version of course has more features.) But on a Mac, consistency is so ingrained in user expectation that it's still jarring that I can't simply hide the program, etc. And whenever I recommend this program to a Mac user, I get shut down for just the same reasons: it looks like a Windows app, doesn't integrate with the OS, and such. It's worth it to me, as I consider JRiver the best music library manager / playback option available for several reasons, including it being cross-platform. But I still would love if it could take on some Mac characteristics in the Mac version.