The problem with using this tactic is that you assume that your opponent is willing to do the same. The moment he decides to occupy the vacant territory with inf you’ll have to attack it.
The result: you just gave him a territory or more for him to occupy for free and force you to take it back. You’ve just surrendered the initiative on that front for him.
Well, that is why it is nitpicking, it only occurs at the beginning of the game and maybe once or twice later.
But I have to point out that I believe your second statement is incorrect, where you say that “you’ve just surrendered the initiative.”
When you’re in trading wars with 1-3 inf in a territory, the advantage goes to the attacker, because 1-3 defending inf don’t hit with great accuracy, while the offense containing fighters/art + inf have a great chance of killing the defending units. The offender usually comes out 1-2 units ahead.
Thus, to prostrate yourself in a defensive position in those trading territories is not good. It is, in fact, giving the attacker the initiative. To put a German inf in Karelia is to give Russia the advantage, because your inf will only hit 1/3 of the time, while his 2 inf + fighter will hit almost 100%. Eventually of course you will have to trade once someone takes the territory, which the Russians should be doing, because they want the Germans to commit forces and get them out of their shell. But as the Germans, dont’ come out of your shell if you don’t have to (i.e. when you already control the territory).
If your goal is as Germany is to fully conserve your forces, then you will not start with the wrong foot by sticking an infantry where it doesn’t need to be. Let Russia start the quibble.
And towards Jen’s statement about blitzing to Archangel through Karelia with a German tank, that doesn’t make any economic sense for the Germans either. Comparing the 2 scenarios:
Blitzing Karelia: +2 IPCs
Blitzing Archangel: +4 IPCs, +1.5 IPC on average for killing an inf (since it’s 50/50 to kill a 3 IPC unit), then -5 IPCs for losing your tank. Net = 0.5 IPCs
In terms of IPCs, Blitzing Karelia > Blitzing Archangel