Real world concepts can be useful when understanding a game. General concepts especially. However, not everything applies to this game.
Logistics: We do not have supply trains, or really, anything. Units are self-sufficient. They heal on your own territory, and not on your opponents.
Strategy: We have the overall strategy. Your country position, unit position, what you have researched, what you will have researched, the disposition of your units, etc.
Tactics: The battles themselves. X Factor, Terrain effects attacker / Defender. Fortresses. Etc. Which do figure into the overall strategy.
The in between grey operational areas.
However, real world constants cannot be applied absolutely. Especially some specific ones.
The amateurs study X and Masters do X arguments are silly. Knowing how to manage your country is very important. Knowing how to work with people (Diplomacy. Aka a bit of psychology, abnormal psychology, manipulating people...Etc) is also very important. Once you have the basic core game mechanics down, you are good to go. Basics are everything. Everything builds off of them.
In regards to Mr.Rommel, he was a excellent tank commander, though a meh Field Marshal. He had common sense, and he was excellent in regards to tactics. He sometimes simply did not look at the bigger picture(Strategy). He led from the front. And sometimes being behind the lines, actually working out things, he did not do much of.
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However, the game is still in a constant state of change. More units will be released. More things will change. And things are even being changed behind the scenes on a weekly basis(In regards to game mechanics).
On a final note, this is a off hand comment to those who claim "Realism", or anything of the sort. This is not a realistic game. It is not a WW2 game. And the reason things are in this game are not due to realism. It is a general strategy game with the theme of WW2, and with some semblances to realism in general, specific areas.