That's the interesting thing about many of the arguments against the F-35 like the "it's only got narrow-band stealth" that retards promulgate as truth on the Internetz without having the faintest idea what frequencies the F-35's LO can successfully manage.The threat from advanced double-digit SAMs tends to get overlooked and trivialized. These systems are lethal against legacy platforms. They are proliferating and will be sold to anyone with the cash and can be put in place with relative ease. Opposing Gen 5 designs may also pose a threat down the road as we can expect these may prolifeate as well.
The F-35 will form the backbone of the US and its allied fighter fleets for the next several decades. It can handle low and high end threat scenarios. Spending money for a platform capable of only the former is counter-productive.Building less capable platforms just eats up limited funds and gives an opponent more opportunities for target practice.
So many say the F-35 shouldn't proceed because of this. They deliberately overlook that every OTHER aircraft will fare even worse than an F-35 if this IS the case, having little or no LO at ALL...