Technology, resources and energy can become a superpower as long as they occupy one, and Germany is in short supply. China lacks technology, resources and energy, so it can only sacrifice the environment and become a world processing factory.
After the war, the starting point of Germany was not low. Only one ZF was defeated and only some materials were looted. The industrial infrastructure of the Germans has not been completely extinct, just a new owner.
Moreover, many factors that determine whether the economy develops are invisible, such as the consumption habits of residents, which cannot be taken away by the war.