Re: ... How many MSFT users affected?
I'd be interested in hard numbers as well, but I suspect there are none.
By November 1 Tech Republic reported that, according to AdDuplex, about 2.6% of Win10 users had downloaded 1809. 2.6% of the Win10 userbase might be around 16 million users, opines TR.
But, "...some say that AdDuplex numbers are not representative of regular Windows 10 users", so TR claims perhaps 10 million users had downloaded 1809.
One of the borks involved only Intel's Skylake or later processors, so for that flaw, you'd need to know how many of the (very roughly, quite maybe) 10 million machines had Skylake. Call that X%.
But wait -- do we even know if all Skylake-equipped machines were borked? I think not, but don't know. So Y% of failures has to be attached to the equation.
For just that particular flaw.
And I have run out of steam. That's the kind of BS you could run on all the different 1809-related flaws. Very mushy, very approximate.