I do agree that a lot of training can be done in a sim, the issue for me is how accurate is the sim? I say this particularly for the F35 when the previously advertised performance envelope changes, we all know the realignments... If a sim had been developed for the initial hoped for performance envelope how certain can anyone be that it has been adjusted to reflect the actual performance of any of the F35 variants. Thinking that I assume an early F35C simulator would enable arrested carrier landings... Carts and Horses comes a bit to mind.