And they did actually. Windows Mobile - the original Windows Mobile, 2000-2012 - had 42% smartphone market share in 2007, a native Win32 API (and .Net Compact Framework for C# and VB.Net too), had WinCE kernel and worked on x86, MIPS, ARM and SuperH CPUs.
All what people like me want is NT kernel, Win classic UI, WinAPI with transparent JIT of x86 exe applications on a mobile device (like WinNT on Mips or DECAlpha or OSX Rosetta). And no nonsense like the metro crap from Win8/10.
I loved it until the 'trendy' movement toward fingers-driven UI started, around version 6.0.