Of course it was all tied up with needing allies to buy to increase order size, and the UK Bukit the STOVL bits, so naturally they had to buy all STOVL jets to increase British industry buy.
It's a rat's nest of everyone trying to please all their stakeholders. It is, eventually, a great jet, but it could have been a better, cheaper jet, delivered sooner, and already past Block 5.
Oh yeah, did anyone mention how long it takes to integrate a new system onto the F-35? Fracking years. All of which has to be done by LM, forever. Because the F-35 is not a jet, it's a Master Contract.