Used to train .... you can really get caught out with very low time people flying aircraft as you protect the operation against them making "pilot" mistakes - problem is they're not pilots yet and they can catch you out with left field stuff that no "pilot" in their right mind would do !
"You don't know what you don't know" and "you don't know enough to be scared", come to mind.
You could get into the definition of pilot if you wish - for a big jet, I'd offer as a start, that it's probably over 5 hours (handling) in the flare - not 5,000 in the bunk