I think the freezer is key. My wife doesn’t work, but nor does she cook. I work full time and do all the cooking. Some meals are simple grilled protein with veg. For pasta, I made a ton of tomato base - basically onion and garlic softened, then chopped toms piled into the saucepan and left to simmer for some hours then left to cool overnight. Blitzed, sieved and frozen the next day. It’ll also make soups, diluted 1:1 with stock - made from chicken bones and some veg in the pressure cooker.
I’ll make a “meat base”. Mince, onion, celery, carrot, grated courgette, peppers, tomatoes, etc. then us3 it for cottage pie, lasagne, chilli etc.
Food, as Ian says, has become complicated. I remember some of my childhood foods; steamed bacon and cabbage suet roll. Plate pie of mince with eggs and macaroni in it. Cauliflower cheese, macaroni cheese - the latter now a fashionable “side”. Stews, casseroles. And the Sunday roast stretched over 3 days. These are still practical if unfashionable things to make. Food as fuel.