There are actually much more reasons for zoning. For instance, commercial real estate pays much more per square meter than residential, so without zoning you'd

There are actually much more reasons for zoning. For instance, commercial real estate pays much more per square meter than residential, so without zoning you'd end up with no resident in many popular areas. In a similar way, if you just let anybody open hotels you have the same problem as what came in with AirBNB except worse, which is why hotels have been zoned in most cities for a long time. You also have other reasons such as organizing public transports, infrastructure, avoiding tax competing between cities and much more. Contrary to some belief in here cities in Europe are often heavily zoned. It can go as far as encouraging or forbidding some special kinds of shops / restaurants (ex: limiting number of fast food restaurants in touristic places to maintain a certain "standing", having special tax for luxury shops to have them focus on a few streets to create an exclusive areas growing in the city and controlling the special delinquency that can come with...).