Part of Germany's problem in 1914 was budgetary. They had a very ineffective taxation system, which meant that they were seriously under taxing their population for the needs of the military; IIRC they were taking in so little money that although they were spending less proportionally than their likely enemies, the military budget was still more than 50% of government expenses. Come wartime and the blockade, Germany has her economic potential limited due to lack of critical imports, so she had to make hard choices about production; in 1914-16 Germany was far more concerned about mobilizing enough men for the war, which meant building up a massive artillery park and supplying shells for those, while also building up her truck reserves for supply purposes. Beyond that they needed to expand machine guns production, build more factories, expand the navy, all while mobilizing their skilled manpower for the front. Germany just didn't have the necessary slack with which to invest in new technologies at a time when they didn't have enough existing ones for their needs. So you would need something pre-war, such as the Burstyn tank enter development, so that Germany and A-H have a working prototype that has been developed for operations at the front.
Germany was on the tactical offensive in the West in 1914-15 after trench warfare set in and during the French and British offensives, so could have put such a unit to use. However unless it was developed pre-war, there is little reason for the Germans to take a risk on the untried technology during the war given their production constraints.
The British and French did not have that problem thanks to their ability to import so much, which some historians have categorized as a 50% increase of their economic potential; they also had access to the manpower of their Empires and neutrals, so they imported labor to replace that which was conscripted. Indo-Chinese labor was huge for France, as were Italian and Spanish migrant workers. Britain utilized her Indian labor extensively too, though not on the Western Front AFAIK. Germany couldn't do that; later they tried to use forced labor from Belgium, POWs, and Russians with mixed results.