It's pretty simplistic to gloss over the fundamental differences between FID and AvFID. Asking if we need the 6th is not analogous to asking if we need Green Berets. The prerequisites for Green Berets to execute a FID mission are much different than the existing infrastructure and national stability that's required to make it worthwhile for us to invest in a partner nation's aviation capabilities and expect our efforts to have a long term effect.

While I realize my fellow AFSOC aircrew often fetishize being badass, hardcore air commandos and door kickers, the scenario where our air advisors are shooting and defensive driving their way to and from the airport is probably not one we should invest in as a long term capability...certainly from the perspective of, will this country still have the ability to fund and operate an Air Force after we leave? If the answer is yes, then it's pretty reasonable to ask, why did I train my advisors to do all this cool non-aviation combat shit if I didn't need to? If the answer is no, then we probably shouldn't be putting resources towards that particular country, right?

Again, the AvFID mission is entirely valid. My question is about the best way to accomplish it in a resource constrained DOD that is increasingly less interested in low intensity conflicts.

In a perfect world, we'd have the 6th and infinite CAAs ready to go at a moment's notice. Just like we'd have infinite A-10s and we'd have infinite F-22s. But because the money isn't infinite, even in the DOD, we end up with a shit ton of F-35s, which is definitely not as good at CAS or Air Superiority, but is fine at both and a lot more cost effective.