I think some degree of jurisprudence is always present in any legal system. It's the natural law.

Yes, but in practice precedence has some informal weight even in civil law systems.

(And in the same spirit, precedence can be overridden relatively easily in a common law system, too, the judge just has to find an obscure aspect of the new case that allows her to argue that the old cases don't apply.)

Doesn’t it at least constitue a data point for future cases, where Google won’t just be able to say “we just don’t hinder competitors, you must be mistaken” and we also get vetted documents on their inner workings and processes that will make the discovery process faster on other cases.