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.
Well, the original comment was about Microsoft products, which includes the OS. I understand if you say you meant to only refer to the Office software as “core services”, but “we” are talking about Microsoft products and I would argue their flagship OS is the corest of them all, and as you said it’s garbo.