Hub,
I concur with your last statement.
Flying in an La-7 in the current MA environment probably has little real life value outside of practicing basic ACM skills.
If you were to use AH, as is, in a structured training environment, in 1943, I believe that it would absolutely have value as a training tool for WW2 pilots.
Additionally, I believe that if we were to give you, or any of the other top tier players, a couple hundred hours in an era warbird to learn to 'fly in real life' and then started teaching you ACM, along with Joe Schmo who's never played a flight sim in his life, you'd spank him repeatedly.
It's usefulness as a trainer would probably diminish rapidly after a couple hundred hours of real life time, but the help over the initial learning curve would be enormous.