My take is the polar opposite from Dan. The key here is the supply rule. This is one of the key conundrums for the German player. You have limited numbers of AE, the only guys who build bridges and limited numbers of bridges and limited amount of time to get this done to supply constraints.
I say buy them, stage them, but commit them sparingly and when/where you feel secure in doing this. Terrain analysis, not only of your entry areas, but of the best defensive terrain for the French are part of this puzzle. You don't need a bridge done that first date, but you had best be done with one by the second or the boys on the west side will be throwing rocks.
There are very real challenges for both sides. The French holding out for three dates with 4 companies of sub-par infantry, a company of wind up toys and an OBA that steadily decreases in value is their problem.
It is designed for equal opportunity whining. But get them in position to take advantage of opportunities, just don't commit it all at once. Very cat/mouse.