None of us know which of our actions constitute a crime. Even worse, in many cases neither does anyone until someone goes to a court and a precedent is set. This is a terrible system.
Also, the concept conflicts with the idea of local government and basically requires a large central world government. I feel like thr idea of simplified laws is mostly an impractical pipe dream propagated by people who don't like that they can't dump poison into local rivers or sell people scams that harm them.
Here is how we can get a proper measure of the problem: how often are people harmed by complex contracts they signed but didn't understand, vs how often are people harmed by laws they didn't know existed? And how often were those people doing something meaningfully harmful to someone else and should have known better on basic moral grounds?