If it's good enough for Google and Apple
> The logical thing to do would be to let the manufacturers innovate and produce these devices while Microsoft concentrates on the operating system, software provision and services, Azure, etc.
Just as Google are concentrating on services, and not rolling out their own line of Nexus phones, having bought up Motorola in 2014 and HTC in 2017 ?
Not to mention Apple, whose tight integration of hardware and software has long been the envy of Microsoft.