I didn't see mentioned, . . .
"Back in the day", . . . (heavily exaggerated to clarify the difference)
Non-academics tended to use Modem7, X-Modem and its variants. Most knew
about kermit, but rarely used it. ("It's probably fine for 7-bit, but it
breaks every 8-bit byte into TWO bytes", "EVERYBODY uses ABCDEFG-MODEM.",
etc.)
Academics tended to use Kermit, and sometimes even feigned lack of
knowledge of the existence of the Christensen protocols. ("If it wasn't
developed by a major university, how can I be sure that it really works?",
"EVERYBODY uses Kermit.", "Kermit is on every machine that has ever
existed.", etc.)
While far from a definitive correlation, it was often possible to draw
conclusions about somebody's background based on those views.
On an only slightly related "EVERYBODY does/doesn't",
which groups used ANSI.SYS on PCs?
"EVERYBODY had a 'doubler'"
"Hardly anyone had a 'doubler', because they already had data separators
and 8" adapters"
"EVERYBODY in xxxxxxxxxxxx field uses Macintoshes ONLY"
"NOBODY uses TRS80 when there is ANY alternative" (re: Model16)
"Why would anybody produce 8080 code, EVERYBODY has a Z80."
"S100 might catch on, if it gets standardized"
"BASIC?? NOBODY would use BASIC for ANYTHING!"
"'Proprietary programming system'? WHICH BASIC compiler?"
"I won't use WORDSTAR, it turned all of my files into ASCII!"
"VI!"
"Emacs would be a nice operating system, if it had a decent editor."
The preceding has been exaggerated for your amusement.
. . .