BV, indeed. It might not be too much of a stretch to say that the traditional roles of sim and live flying are being reversed. Weapons practice is almost totally simulator-bound due to the expense and large safety traces of contemporary weapons. EW kit can't be meaningfully stimulated or transmit for real-world COMSEC reasons. Radars likewise. 5th gen aircraft can't rehearse LO tactics without giving away clues to their vulnerabilities. Datalinks can't be used to their wartime potential due to peacetime frequency band constraints. About the only thing that can be done without constraint in the aircraft is general handling for currency/safety purposes. Given that balance I'd expect F35 QWIs, EWIs and other supervisory pilots to be routinely operating the sim.