I think the system is fine as it is. Sure, the attacker has the advantage 90% of the time. But when it’s their turn, the other side can do the same thing.
I’m also not sure how making the system more complicated will make it better when again, when it’d their turn the defender becomes the attacker and the attacker becomes the defender.
On the strategic level, any piece of equipment that sees action is going to be regularly lost, and need replacement, but this is not always seen in A&A.
Excellent point. I see this imitated in the game in two ways:
Replacements are too small to portray.
As I said earlier, the attacker-defender mechanics work for both sides (hypothetically equally, more on that later), so if defending aircraft and tanks are being destroyed by attacking infantry as often as you say, then you will need replacements.
In too many games, German aircraft fly constantly against the Soviet Union, never taking losses while German infantry get torn to pieces.
I’ll admit this is my one weak spot and is a great point. My defense assumes both sides equally attack, but the game’s dynamics probably mean the Axis attack more than the Allies do. If your real problem is balance, I suggest you should admit that and we can better understand your ultimate goal.
I wish you luck on your further planning.