Yeah, but that is a crazy situation isn’t it?
If a competent guitarist tried to play something from memory they haven’t played for three years; their first attempt is likely to be a bit dodgy, with the odd wrong note or wrong chord while they remember the proper sequence*. Once they have recalled the piece, they will be able to play it extremely well.
Pilots have the problem of not being able to take the aircraft home to practise stuff, (!! that would be cool
). The only opportunity we have to go over things and refresh our memories, is in the SIM. If the entire SIM is a jeopardy situation, officially or unofficially; no pilot will want to explore or do anything beyond what is strictly necessary to pass that particular SIM.
*(I have heard Paul McCartney go wrong at a concert, stop and start again, but nobody would claim he is a bad musician).