"It’s still a statement about regulatory costs and requirements, essentially, that it is often also cheaper. In a sane world, cooking at home would be a luxury."

I would tell my high school econ students that "Do it yourself" is market failure. If you build your own deck for your house, the market is distorted in some way (and don't tell me that you love building decks, because you don't do it often). The biggest distortion is that if you build your own deck, the labor is not taxed. Same with cooking your own food.