But again, the difference is that it's full Windows 10 on ARM with x86 Win32 emulation. You can take your 32-bit Windows x86 software and run it with no changes needed if you want to. You don't have to buy into any new ecosystem because there is no new ecosystem.
The x86 desktop application support is for the desktop use case. For a phone you'd plug it into a dock and use it as a desktop or into a laptop shell and use it like a laptop. Like this for example: https://www.youtube.com/watch?v=KNzatcI9Fqw