Fortissimo,
I understand your view, but disagree. It is perfectly possible to understand the operational environment (I didn’t use your word, experience) without having been part of operational planning or delivery. Most importantly, CAS is not the RAF’s warfighter, he is the RAF’s strategic leader. My opinion of any previous CAS has not been shaped by how physically brave I perceiive them to be. I would rather have a man who is known for being a great leader, a thinker, and with an ability to influence Main Building.
in other words, I think it would be perfectly reasonable to consider having non-aircrew in the job. There’s a certain Engineer who is about to become a 3 star who could be an excellent future candidate!