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.
It’s only slow if you’re running a slow computer. Anyway it’s way faster than all your electron apps which each insist on taking up four for gigabytes of RAM