I can only speak from my layman's understanding of US law. In the US, there's a doctrine prosecutorial discretion. Basically the police and prosecutors can choose whether to arrest and charge someone for a crime.

> "Maybe in places where code law is mostly binding, there’s a lot more pressure on the legislature to keep the law books up to date with the current norms of society."

In the US, where everything is so entwined with politics, there's a lot unenforceable laws still on the books.

For example, the US Supreme Court struck down sodomy laws in 2003. Last I checked, Texas still has a law on the books criminalizing sodomy. Sure Texas can't enforce it, but the conservative majority in the legislature won't actually repeal the law because politics. Similarly, when the US Supreme Court ruled that banning same-sex marriage was unconstitutional, Texas had to recognize same-sex marriage. But there was no law allowing same-sex couples to divorce. So there was this weird limbo wherein you couldn't get divorced if you were in a same-sex marriage.

America is weird.