That quote was in the context of simply separating values with newlines (and the list also included "your language’s split or lines function").

Technically you don't even need awk/sed/fzf, just a loop in bash doing read would allow you to parse the input one line at a time.

while read line; do 
   echo $line # or whatever other operation
done < whateverfile

Also, those manpages are a lot less complex than the documentation for C# or Nushell (or bash itself), although maybe working with C#/nushell/bash is "easy when you’re already intuitively familiar with them". I think the point was precisely the fact that doing that is easy in many different contexts because it's a relatively simple way to separate values.