Originally Posted by
Duchess_Driver
What I was hinting at was the woeful lack of understanding of the aircraft systems ...
I once learned the POH to a greater level of detail than my PPL examiner knew it - when he asked what instruments would be lost with a total electrical failure I included all the engine instruments (as well as the flight instruments) and told him which ones would and wouldn't be affected, not something he kept in his head for a C152. I've forgotten all that now, of course.