In fairness, adding PV to buildings seems sensible even if it weren't terribly efficient because to not do it simply seems to be wasting energy that is literally falling from the sky for free. And I would agree that a major country such as Germany being dependent on other countries for something as significant energy is rather poor as a policy decision, given how it allows other countries to use that as leverage. Always good to have leverage over others, not so good for them to have it over you.