The variety of electronics, toys, clothes or food available to an average person has definitely increased and I agree that one can spend less and maybe even work less (depending on what line of work they are in) by avoiding them. That's true.

The problem is they are not the big expenses that improve someone's quality of life. Decent housing, health insurance/healthcare, education and transportation are the big spending items for most people, not toys or even phones. Most of the things you mentioned are affordable to almost everyone in the developed world, maybe in an inferior form (like a huawei instead of an apple, h&m instead of gap) but still available.

For an average joe who has two kids and has to be at work because most people can't and don't work remotely even today, "hacking" inexpensive living isn't so much about giving up on their huawei phone or h&m clothes. It's more about giving up on having a decent place to live, giving up on their children's education, not being able to commute to work, etc. And that's not quite doable at all.