You may be correct on the limitations on responsive design and redoing Roon. I was speaker with a software GUI expert on this after your email and he pointed out some limitations that may make the design less than optimal.
I think I will answer this question myself and design some app on Windows 10 and see how it works on the various devices. I have to learn how to do this first but that won’t take too long. Maybe it will be responsive or maybe Windows 10 takes care of this using some other methodology baked into the GUI design pattern.