alt Hacker NewsZoning codes have some uses, doesn't mean they're still net positive value. Maybe the current situation is so bad that letting a pig farm or a coal power plant be build right in the middle of a residential neighborhood is actually a better tradeoff than whatever we have now.
In many European places there are only a few zones: farming/industry, mixed commercial/residential, and of course random other stuff like parks. And when you build you can only go a couple stories taller than the average in a certain radius unless you're explicitly approved to build a skyscraper. This height limit is also displayed on the zoning map but I believe it's regularly adjusted.
i don't know if this is the case everywhere in europe but i understand that at least in germany instead of zoning the local government approves the purpose of each building individually. so instead of deciding this is a commercial zone, they decide how many shops and businesses they allow in that area, and what kind of businesses they are. and once a building has a specific business use, then it can't easily be changed. so in effect that is very fine grained zoning. this is as flexible as the people in the government who make the decisions.