For current third-world proxy war purposes its not very useful; but in a real war its an expected possibility that missile & countermeasure tech accelerates suc

For current third-world proxy war purposes its not very useful; but in a real war its an expected possibility that missile & countermeasure tech accelerates such that an F-35's current missile armament's range may shrink to dogfight range, at which point you need a cannon. Of course a ground-attack plane shouldn't be dog-fighting in the first place but you gotta have that multi-role capability