Our current adversaries are mostly insurgents - however, if you look forward at dwindling resources and nations doing the unthinkable and waging wars over them, then the F-35 makes more sense. With a complex and lengthy development process you're planning for the war after the next, not the current.
That being said, with all the problems the F-35 has, much like the Eurofighter before it, it might be no match for what another advanced economy could produce.
That being said, with all the problems the F-35 has, much like the Eurofighter before it, it might be no match for what another advanced economy could produce.