I can't see how it's ever cheaper to 'grab something ready made' if the quality is anywhere comparable.
Home cooking can be very economical and any ready made food for a similar price will be absolute junk.
It can be time consuming but often isn't. Pasta cooks in little over 10 minutes and you can do the sauce/dressing in the mean time. The amount of olive oil that is used per serving will be pennies and if you use seasonal veg, that's usually not expensive.
You can spend a lot of time and money on cooking but you can also do it very cheaply. If you don't have a lot of time or money, then there's always things like omelettes, egg or beans on toast, that sort of thing. Cheaper and less unhealthy than cheap ready made food.
All our cookware comes from supermarkets or Ikea and isn't particularly expensive and lasts for years/decades. Despite cooking quite a lot, using electricity, which is more expensive, our electricity bill is under £2 a day and that includes the shower, lights, dishwasher etc as well
What ready made food are you suggesting is cheaper and quicker than the examples above? And that's before you consider taste and quality - anything ready made with 'decent olive oil and veg' will cost a fortune - you're looking at Charlie Bigham, Cook, artisan farm shop stuff, which is all £££s, especially if cooking for more than one person.