On a site, I happened to use the phrase "In the first instance" ...
(Not that this is relevant, but notice the many upvotes suggesting that presumably, it reaches baseline understandability in a typical mixed-language, mixed-age, mixed-continent SE audience.)
I was utterly astounded that someone did not know the phrase,
Astonishingly, more people had not heard the phrase; my total astonishment/disgust with the Youth Of Today, etc. continued when an otherwise highly literate user figured it may be "regional" or such ...!
In particular: there was a (to me, completely bizarre) thought that it is more "descriptive than proscriptive" (or, something?)
My questions (here on the "Excellent English SE site") are
Could it be this ordinary phrase is falling out of popularity/meaning? If so since when? (Kids of the 60s? 90s? 10s?) Is there any real way to know this? Does it appear in Harry Potter?
Is there anything to the "unfamiliar in action sentences" concept? (i.e., as I understand the commenter's comment, "ITFI X happened" versus "ITFI do X".)