I do Air/Ground at a busy UK airfield underneath the London TMA and an airports Control Area with a TMZ.
Consequently most aircraft are now fitted with 8.33 radios ( we have changed frequency) and also mode S transponders.
There have been numerous radio problems and TMZ infringements because pilots have not read their manuals.
The “ best” was a regular visitor who arrived overhead non radio and proceeded to land on the reciprocal,
all because he hadn’t read the manual of his new radio fit and didn’t know how to select our new freq.
So it’s not just Flight Manuals, or whatever you like to call them nowadays, that don’t get read.