MSFS might be useful, but it's not AH, and the things you practiced in it don't even exist in AH. Also, you presumably used it as practice, instead of learning solely from the game. We don't have realistic startup, shutdown, landing, patterns, weather, etc etc, and there's no penalty for any mistakes.
We may acquire a lot of knowledge with regards to planes, relative performance, gunnery, etc, but we're doing that with the experiences of those real pilots, and we're likely picking that up from time with a trainer (some of whom are real pilots themselves), or reading, or watching films, again from people who are often real pilots, or at the very least people with considerable experience in sims. Most importantly, IMO, that occurs outside the game. I could learn those same things without ever flying a single sortie.
Now, I would agree that flying a simulator against trained opponents, in addition to real training, would be a benefit, but AH is not that simulator, and the opponents in AH are not, for the most part, pilots with any experience whatsoever. Saying that you would benefit in a real world situation because you have a few hundred completely unrealistic engagements against completely untrained opponents is just completely bull****.