Windows
Yes, lets have a XP/Win7 style Windows, ditch the crippled "Home" version and all the "Cloud" stuff and all the Telemetry / spying and all the eye candy (but proper shadow effect icons like Win 3.1 to Windows 2003). Even MS admitted that Aero was a mistake. Bring back a proper native Forms API, but move/keep GDI out of Kernel.
However don't drop important but little used features. Unlike never wanted (ribbon) or never used features, little used features might be important.
Instead of gold plating and adding features, reduce bugs, inconstancies and vulnerabilities. Write NEW kinds of software instead of version 15 of Word or 12 of Windows.