There are news reports of couple of Windows updates that would trigger BSOD.
If I recall correctly in some 1709 machines WU would absolutely fail to update without separate patch. (kb4054517 was one that failed for many, I think)
I had errors in 1909 that would prevent both WU and MS Store from updating (and downloading new apps from the store).
How can service as important as WU be so bloody broken?
Yes, we need Sun Valley to get some sense of cohesion in UI and UX, and of course it is done by different team but MS needs some serious bug crushing to do and they need to be very liberal with bug spray.