well if you have medics and in 1943 tech it won't matter too much. The problem isn't so much trained crews the gunner training goes pretty fast and driving a tank ain't that hard, its having skilled officers and NCO's that is the issue, and that is not represented in game.
This is also true and what I was thinking of in real life.
I don't know, would people welcome a return of officers from HOI3?
Personally, if it had a good game mechanic attached to it, why not? I'm not sure how they could represent things like officers or pilots in the game. Maybe you'd have to construct more military training schools, and each one bleeds a small bit of your political points while in use? That way you couldn't just have so many that you wouldn't care about losses.
We'd better get used to new features since this game will be supported until the mid 2020s, I assume. If you could go forward in time to 2025, and take a look at this game with all of it's expansions, I am sure there will be a crap ton of new features.
Officers might come into the game at some future point.