To me the foundation of those rules - not eating pork, non-scaled fish, shrimp, etc - lies in the practical aspect of what happens with food in warm climate wit

To me the foundation of those rules - not eating pork, non-scaled fish, shrimp, etc - lies in the practical aspect of what happens with food in warm climate without refrigeration. Lean meat, scaled fish more probably dry than rot. Whereis fat meat, non scaled fish like sturgeon, shrimp, etc. will sooner rot than dry. Getting for example regular fish dry salted is easy, where is attempting to get sturgeon dry salted you'd more probably end up with rotten dangerous to eat fish. The similar about mixing dairy and meat - dairy in warm climate is easily gets populated by bacteria which gets nasty if added with meat.