We're not robots in a factory, striving to achieve all of our dreams in the "most efficient manner possible".
I don't bother learning to drive, and use public transport extensively, because I value the ability to relax whilst traveling long distances over the shortest possible journey time.
I love to cook my own food because I enjoy it, because I enjoy being able to vary end product and because (god damn it) the slight unpredictability of the output makes it more interesting.
Sometimes, I go to the corner shop instead of the supermarket because I value the convenience over the cheaper product.
If I could find a job that pays a similar rate but less hours, you know what .... I'd probably take that as well because maximising the amount of money I can produce in a day is NOT the sole purpose of my life.
What's more, food is probably a poor example because I'm pretty sure we're producing more than we need to feed everyone. We're just distributing it poorly and prioritising profit over people, now that IS an inefficiency worth thinking about.