Problem with that is you also need fiat for when you need to deal emergencies or spontaneous expenses, you can't be putting your bitcoin in and out every time that you need to spend your money, you will end up not saving anything and you're losing money on tx fees, a healthy balance in fiat and bitcoin investment should be the way to go instead of just relying on the chance that you don't need to spend anything today. You don't want to be having an emergency and then ending up with not being able to get your money out of bitcoin or crypto because there's an ongoing price dips in those investments, that's going to suck so bad for you.
If you really want to go all in with crypto investments and you're to stubborn to listen to reason and logic, might as well put in some investments in insurances, at the least you won't have any issue with money when you need it because you at least have insurance at your back burner to help you through the rainy day.
No one denies the potential of investing in bitcoin, but it is puzzling that many people do not care about these basics. We still need fiat in our lives and will even depend on it for a long time as long as it remains the primary currency in our economy. We should invest in bitcoin but only invest with idle money and make sure it is money we do not need in the future, we should not put all our money into bitcoin, including savings and daily living expenses. Bitcoin is a volatile asset, does not increase vertically and can be dumped at any time.