There’s so much that’s less than ideal about this. A lot of people don’t have a big freezer. Some can’t afford to pay for bulk ingredients up front. Some people won’t have a half day spare to spend it cooking, especially if they have kids. And then there’s the depressing aspect of eating the same food everyday.
I’m lucky I enjoy cooking so don’t mind it taking up my evenings (nor do I have kids or a small freezer or work full time on minimum wage) but even I balk at the thought of meal prepping.