I also question if there was even political will in Germany for total mobilisation early on. Bruce Bueno de Mesquita and Alastair Smith argue in The Dictator's Handbook that autocratic states both start wars more casually and fight wars more casually in contrast to democracies. Essentially, as the ruling coalition gets wider and wider across a nation, the relative sacrifice each member of the coalition must make in order to increase military expenditure gets smaller, and the more likely that goods secured by victory will be shared across all of the nation, so in the case of war democracies are more ready to go for maximum effort. Of course, Germany did eventually put everything it had into the fight, and the USSR did the same the moment the Patriotic War started, but that could be explained by the stakes they were in: By 1943 it was clear to the German regime that they were under existential threat, with especially the top members likely facing the gallows, while for the Soviets it was clear form the start that their only choices were victory or extermination.
For Germany's ruling class of party officials and businessmen, flush from the astonishing conquest of all of Western Europe including the ancient enemy France, and gearing up to fight the Soviet Union which just humiliated itself in Finland (another case of my point: The Soviets didn't need to conquer Finland, while Finland obviously needed to defend its independance) to think "We're in dire straits, we need to give everything we've got if we want to win", you're going to need srom pretty persuasive rhetoric from Hitler (how can a cause be extraordinarily difficult and destined to succeed at the same time?).