.bq under Napoleonic law, these would be written down in a law, and if they weren’t, then the previous judges decisions would bear no significant weight on an upcoming decision as the previous decisions are not considered precedent law.
That is not really so clear-cut as lower courts will tend to issue judgements that are aligned with jurisprudence in order to avoid an excess of appeals.
In some countries like France – that took a while to reform and modernise their body of laws – jurisprudence was / is an important tool to adapt & apply 1800es vintage formulations and economic concepts to modern practices.
So while in theory legal practitioners recoil at the idea of jurisprudence carrying any sort of weight under a Napoleonic regime, in actual practice it does, and together with doctrine is one of the sources of law reform.