I watched a documentary on the F-35 a while ago and for the life of me can't find it. But one of the Navy reps mentioned that the F-35C is also rated/limited to 7.5 Just like the (Bug and Cat) they asked him why not 9 like the A model and he said if they had wanted that, it was possible in the JSF program but the added weight to the airframe was, in their minds, not worth it. Sustatined High AOA control at slow speed and solid acceleration is good enough as far as they're concerned.
Obviously take that with a grain of salt but it was interesting to me. High G loading has definite merit in gun fights where radius is king but in the world of HOBS I don't think it's as important as it once was in regards to BFM. ITR is the bigger question now, when the missile employment envelope pretty much negates any sort of sustatined situation. And 7.5 is more then enough for that kind of quick energy dump for a high aspect shot opportunity.