Is food really cheaper? That's not what I heard but I don't know.
But that's a weird take. Quality of life is not entirely dominated by your purchase power if you have enough to sustain life. What about having time for culture, friends, family, quality of the environment, safety, access to healthcare etc. The only exception may be housing.
Some cities here (in europe) have an absolutely incredible quality of life and I would never factor in the price of groceries because it doesn't matter. Everyone in the middle class can afford groceries. Housing maybe, in some cities it's a real issue, but I personally don't care as much because I don't really need an abundant apartment so I always find something. I want beautiful cafes just around the corner, vibrant, active culture from fine art to independent, small artists and beautiful parks and buildings.
I would never trade it for a big car and a big house in some suburb.
A friend of mine is working 32h a week and I am starting to think that he has figured out how to really improve his quality of live. On a programmers wage you're still middle class, you just earn so much. And he's travelling so much, meeting friends, getting into hobbies or just enjoying a really nice coffee in a cafe, taking in the beautiful autumn lights, while everyone else is working that you're always a but envious.