Neowin: User concept re-imagines File Explorer with Fluent Design.
I'd actually like to see something like that. Generally I've come to appreciate the new age UIs that pop up in W10, mostly because I've already suffered their design evolution from mobile platforms. Much as I did various desktop horrors from Unix and Microsoft systems.
Windows 10's file explorer largely keeping the status quo left me with mixed feelings. But the fact remains of you end up suffering a GUI file manager: Microsoft's is the gold standard to curse at.