>Criminal laws are written broadly and legislatures trust prosecutors to apply the laws to the subset of conduct that falls within the arguable letter of the law.

Not in France. You Brits and Americans have that weird Common Law system that relies on broad "laws" (more principles, really), judicial precedent and court decisions, whereas France and most of the world's judiciaries adopted Romans and Napoleon's Civil law system where the legislators write detailed legal codes that the courts then apply.

https://en.wikipedia.org/wiki/Civil_law_(legal_system)

Honestly, for me, Common Law is a medieval sh*tshow where nothing is really legally certain...