Germany’s misfortune or fortune in terms of being capable of winning will be determined by the playtesting, just like it would have been if there were rail movement.
It sucks that the game is without rail movement, but that has nothing inherently to do with balance.
Let’s say that there were rail movement in the game, and the playtesting overestimated how much that actually helps Germany. Germany would be screwed then too, just like if playtesting didn’t take into account that Germany has a long way between Moscow and Paris.
Rail movement’s absence sucks for flavor reasons, but please realize that the absence doesn’t doom Germany.