I still make pastry, though it’s really my trusty old Kenwood Chef doing all the work.
Only the other day I made a big batch of tomato sauce for pasta - tinned toms, onion, garlic, celery, herbs, veg stock cube, tomato purée, a little sugar. Honestly took very little time, blitzed it once cooked in the blender.
I make beef burgers from good quality mince, again takes v little time. I make 4 - 2 for now, 2 for the freezer.
As for mashed potato, unless it was just for me, I can’t imagine buying it ready made - we want such a lot, mashed with butter and milk, 😋.