I'm not sure that I follow the subtleties of your logic ..
(a) clearly the sim is artificial as it is a bunch of computer gadgets doing their thing in the background and we all hate computers ( .. although, after 10 minutes or so, it gets more than real enough for me ..)
(b) you would prefer "real" pressure, fail to achieve the desired goal, and become dead in the process ?
Practice in the sim may not guarantee a successful outcome in the real world but surely it puts you way ahead of the game compared to the guy who hasn't had the opportunity to play in the sandpit first ?
If it's good enough for the TP fraternity to play in the box for a lot of hours before having a look at the real toy first up these days then doesn't that give the rest of us a clue ... ?