But the reality of a foreign-language school is that you need more than just "nationals" (people who speak German at home or have one German-speaking spouse in a couple) to make the finances work. And quite a few American parents were and are interested because of the quality of education. But once their kids were enrolled, many of them wanted more safety, more discipline, a less casual attitude to kids getting naked, and academic work assigned to preschoolers which is not part of the German pedagogy.
All of which made me wonder "why did you choose this school? And if you chose it for its results, why challenge the process that gets those results?" But indeed, by the early 201Xs, the playground had been neutralized into the same old anodyne sterility of the public parks.
(Amazingly, Silicon Valley has two German schools within a few miles of each other; one is subsidized by the government, the other is not so you get to pick your ideology. But it does split the customer base).