As an adult often with a middle to upper class career income, have always been frugal. By having at least modest saved funds to last at least months, one doesn't need to have daily anxieties of living week to week nor being too afraid of losing one's jobs. Even when I was mostly poor during my 20s, never bought anything on credit including vehicles, always paying cash and bills on time. My primary leisure pursuits, photography, backpacking, skiing, were never too expensive to enjoy.
Have never kept budgets and just crudely monthly peruse and check off bank statement numbers and paper cashed check bank records. Although I have a single major bank premium credit card, often pay mailed bills with paper checks, don't use online banking I don't fully trust, and always have several hundred $$$in cash in my wallet.
Having worked for numbers of corporations from tech small start ups to corporations, I often just quit for various reasons between jobs, never fired but sometimes laid off within groups, never taking employment insurance, spending my savings down enjoying my frugal life until funds got low. Was always able to get subsequent jobs after not working for periods that is usually a reason for rejection, because I had an impressive stack of printed out on paper annual job reviews, and could impress taking skill tests, or conversing with hiring managers.