I've said it many times, but the best feature out of all Windows 10 (especially Mobile) is Continuum. It really is the fruit of the universal app concept, adapting to both screen size and input type, but on a single device and even in a single experience.
I have yet to try Continuum, but from all the I have seen it's pretty good, but still in it's infancy. Since it's basically a desktop in your pocket, it should behave more like the desktop version of Windows 10 with snapping and all. The top ARM CPU's in
most smartphones today should be as capable as Intel Atom Bay Trail processors released in cheaper Windows 8/8.1/10 apps for the past two years, which I feel perform magnificently (for what they are) in full Windows 10. As such, the experience should be vastly
similar to the standard Windows 10 desktop experience and that's what everyone else who buys into the Continuum hype expects.
You need multi-tasking and side-by-side apps. You need less restrictions on what you can run and what you can't. If an app can't scale, then leave it forced into a "docked" app. Full Windows 10 File Manager. Windows drivers for all common accessories (input
devices, printing devices, display devices). Can continuum do multiple displays (via USB)? It should! Future hardware should do it in the dock with two monitor support, since anyone who does any productive work uses multiple monitors (or maybe those ultra-wide
ones people use now).
Anyway, Continuum SHOULD function like a desktop version of Windows 10 because that's what people expect. Nobody wants to learn a new paradigm when they don't have to, and they don't expect to when the product has the same name.