OP says Windows needs builders to make applications and that is what Windows Lite would enable (or expand) but then says Windows Lite shouldn't include .NET one of the primary frameworks to build applications on Windows.
Right! Everything from word to the calculator app uses .NET these days. Even many games!
Honestly, I think starting from win32 again would be a breath of fresh air. Also, note that I described it as an option, no one would be forced on Windows Lite. It was my own speculation that it would become popular.
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.NET is still installable as a standalone thing. In fact I probably have several versions installed on my current Windows PC. No reason Windows Lite couldn't also have .NET installed _when you need it_.