Let alone again before

Grazing for something in old LJ entries, I find that I, or we, discussed the new deformation the usage of "let alone" meaning a more specific or recondite thing (that's a poor definition).

http://crowleycrow.livejournal.com/125167.html

Some of the smart people who commented on that original back in the dim days of 2009 have not visited here lately.  Sigh.