Well said, Mfriskel. Anything other than actual flight tested and recorded data is set to give what is known as an "off model" result (i.e. best guess) by the programmer.
I used to fly my fixed wing aerobatic display sequence in the Puma simulator; if I'd tried it in a real Puma (which I also used to display) I'd be dead at first attempt.
Having said that, sometimes the 'sim' used to indicate a crash when it would not happen for real. We got the programmer to come in and alter the landing limits to prevent that from happening as it upset the students.