What's the difference between ancient cast iron pots and non-ancient cast iron pots?

One is to bring in iron, and the other is to isolate iron.

The advantage of casting iron pots is that they bring in iron when cooking. If there is a coating, it will not stick to the pot, but will isolate the iron.

The previous pots and pans were all raw iron pots. However, since more than a decade ago, after the appearance of pots with "non-stick" coating, the workshops that produce traditional raw iron pots have closed down. The most terrible thing is that the non-stick pan is a chemical. After the coating is damaged, it will cause harm to human body.