I definitely get the point of such a diversifying, however, I think, that this is also a matter of time. If you prepare your savings in fiat for a long time, they will become victim of inflation, unfortunately. This is why, in my opinion, from time to time you have to convert this fiat savings into more reliable assets. While having some savings in fiat, especially in cash, is undoubtedly important, it is also worth remembering that this form of keeping money is not truth worthy.
You have a point in this matter, we must think wise in keeping our money in terms of expensing it. Though, everyday we need some food to eat and things we need to use everyday like our in our personal hygiene. Everything should be in budget, we don, need to buy excessive things in which it is not important. And for us to do this it needs discipline and self-control as well. So thanks op at least for the effort you did here to remind others for this matter anyway.
You don't need to eat at those expensive restaurants if you can eat it in a normal restaurant, because if you are just earning minimum wage, then you don't need to eat at those restaurants. Don't be fancy, and you are right, don't buy those nonsense items that you don't need. It is really about self-control because, as others have stated, if you can't afford it, don't push yourself to afford it at that time; instead, work hard so that you can afford it in the future. Right now, because of the high prices, people are sure getting a budget on everything.