Microsoft is losing Builders fast. They're switching to MacOS and Linux. The biggest pull keeping people on Windows, outside of shear inertia, is content creation and gaming. However, even these are falling to Linux.
Without Builders, you don't have software, and without software, you don't have users. This is why Microsoft needs Windows Lite.
Windows Lite is a stripped down version of Windows. No telemetry, no spying, no ads, no AI, no .NET, nothing. Windows Lite is just win32 with a lightweight shell and graphics drivers. Maintenance/security patches happen monthly (if there are any), and the user can decide to apply them automatically or manually.
Windows Lite is perfect for gamers and developers. It's a stable backwards-compatible target. Win32 is a bit clunky, but because it's stable devs build lightweight wrappers around it to give it a good API. Windows Lite makes Windows a platform that people want to build for again.
Because gamers and developers love Windows Lite, ordinary users decide to move to it too. Universities, companies, and governments all buy licenses for Windows Lite.
Over time, Windows Lite becomes the main, and only, version of Windows. Development and maintenance costs fall, and somehow Microsoft makes more money than they ever did on an OS.
Windows Lite is $49 for a permanent license. No subscriptions.