I'm not sure a slight refresh of the Notepad UI is core functionality of the OS. I don't like Windows, I actually quite despise it, but I think the rolling release approach is far better than, say, macOS' yearly dump. You end up with features that are half-baked or pushed to the next year. Microsoft is taking a saner approach with Windows releases, IMHO.
I thought Microsoft had announced they are switching to an annual release cycle.
I don't think it makes much difference to the quality, some features are too big to fit in a single cycle anyway. The question is whether they have enough discipline to hold back projects that aren't ready. In this respect neither Apple nor Microsoft seem able to say no.