and we’re all worse off for it
Windows Phone died, IMO, because they made a bad bet after WinPhone 6; the dev team spent an entire dev cycle trying to build the OS out of C#, always hoping that the perf would come "later"; when it came time to ship, the perf wasn't there, and they had to ship WinPhone 6.5, which didn't have the tech innovation to match Apple & Google, and the app builders noticed.
The lack of apps *really* put the nails in the coffin.
WinPhone 7 & 8 also suffered greatly from trying to have a unified code base with desktop Windows.
Still and all, WinPhone was my favorite phone OS, and I was very sad to see it go.
If you still have a Lumia 950 or 950XL, you can install full Windows on it:
Man did this strike a nerve....I always try to explain to clients that "we have the best product" does not immediately grant them world domination. And the other corollary to this is the "first mover advantage" which often is not. First joke I ever heard in Silicon Valley was, "you can always tell the pioneers in Silicon Valley by the arrows in their backs."