And the fact that the Argentineans were operating at extreme range, where switching on afterburner=swimming home (i.e. death), engaging in a dogfight=swimming, etc, etc . . . . .Darn right. The Falkland Islands conflict shows the importance of training and availability
The Harriers were inferior on paper to the Mirages, other than their ability to vector in forward flight - which never occured in battle. The Harriers were hugely out-numbered by the Argentine Air Force and Navy fighters. The Harriers didn't have AEW, and the AIM-9L sidewinder was never even used in head on aspect - always fired from the rear so earlier versions would have been just as successful.
In short, the Harriers kept the Argentine Air Force and Navy fighters at bay, and shot down a lot, based on training and system availability, not based on better equipment.
The Harriers shot the FAA out of the sky because they were close to base & the FAA weren't. They were outnumbered in total numbers, but not in the numbers in the air over the combat zone, which is what matters, & that was because of transit time, availability of AAR (bugger-all), etc, for the Argentineans. They might have been superior to the FAA in an even fight, because of training, missiles & radars, but that wasn't tested.
It's like a shop. What are the three most important factors for success? Location, location & location.