While many will point to its performance and app compatibility issues, the biggest problem with Windows 10 on ARM is hubris. This platform exists for only one reason, which is to screw over Intel. And that is not an origin story to be proud of. Nor is it a solid strategy for success.
I'm reminded of Microsoft's initial efforts around the Zune, it's ill-conceived and ill-fated digital music player. At the time, the software giant was suffering from early-onset Apple envy and it still believed that the Microsoft brand meant a damn to consumers.