Thanks for the quick reply and sorry for the late response.
Unfortunately my machines have said that there were no new updates available, when there were important ones that it had (apparently) not done (according to its history listing). Please see original question again and the discussion threads about virus protection program compatibility issue preventing updates from occurring (e.g. kb4056892). My experience suggests that's what may have occurred, since it got the update I was seeking after our IT folks worked on it. However, I confess I don't have sufficient visibility into all of this. [For the record, that was on of my Win 7 desktop machine.]
Interestingly my Win 10 home machine just did the Feature update yesterday and it still shows the Quality update history including the Jan 1, 2018 release installed on 1/3/18. Perhaps it is running a different flavor of Windows 10 and the one I was seeking is not applicable to the work laptop.
I will follow your advice and assume the updates are stable now. (Just saw a new quality one come in today :-)