Yes. The difference between a primed clay pot and a slow cooker is that the clay itself adds a certain flavor in the convection, you can set the temperature very low and cook overnight in it whereas the slow cookers sometimes dehydrate what's in them. Also the clay pots with lids (or tagines, too) are good for making yoghurt overnight as well
You can also do higher heat stuff with these. Macedonian and Bulgarian cooking is sometimes higher temp, sometimes lower temp. Tava. In almost all countries of europe that had Thracian populations, you will see traditional clay pots still being made. I saw the most beautiful of these in Romania with a traditional blue glaze. I have a rather large one from Bulgaria. They are generally lead free so you don't have to worry about them.
http://www.foodnetwork.com/recipes/thracian-clay-pot-recipe.html
https://en.wikipedia.org/wiki/Thracian_language
Kugan mound cultures used these kinds of clay pots, and there are prehistoric finds.
Contradiction seems to be a regular issue in the OP's posts. Makes things rather confusing..
Microwaves are amazing but they kinda have limits....disappointing, i know. I once tried to bake a cake in the microwave...i didnt want it anyway lol
