Mollygo I can’t agree with you on your point 3 ‘cooking food that can be cooked quickly and thus cheaply
My parents and grandparents cooked stews, pies, and puddings, all of which took far longer to cook than many meals I make now.’
You’re right in that our parents and grandparents cooked things that took longer - but they often used cheap meats, home grown fruit and vegetables, and cooked lots of food at once when they put the oven on - so a casserole would be cooking at the same time as a crumble for tea today and tomorrow, and a cake, and jacket potatoes. At least, that’s what I remember, they were very frugal compared to most people today.