As for the 800 m runway:
https://www.youtube.com/watch?v=SNlGgQ6VEbY
I count 5,000 lb of air-to-surface ordnance, two heaters, a centerline tank and a gun, which is probably meaningful, particularly if you are on the receiving end.
I don't know what the full support CONOPS is for the F-35B. I do know that some past AV-8B forward ops were supported by fleets of 8000 gal tanker trucks, which in a hybrid war scenario would make
The Wages of Fear look like driving a milk float in Wimbledon.
I respect your views and experience and regard your facts as objective and reliable.
I'm just coming at this from a strategic perspective - and believe that the US has over-invested both in this particular capability, and, more generally, in the notion of amphibious assault against a defended coast.