It's better to save some of the funds in the bank for funds when there is a sudden need when you need it and can keep it as long as you don't need it, whereas if you are still working and earning more money then it can be put into bitcoin with the DCA strategy weekly or monthly would be a good way in my opinion compared to bitcoin all the money.
Important use free money for investing in Bitcoin and not try our saving money in the bank and move it to invest in Bitcoin to earn daily day profit, I supported with your ideas about we need have saving money in the bank and not priority always investing in Bitcoin, I know potential profit earn when investing in Bitcoin, but when bad thing happen to us and and haven't money saving in the bank drastically we have borrowing with interest need to pay later.
Not allowed to earn weekly or monthly profitable in Bitcoin investment, but when bearish coming how to earn profit and can't controlling with source income when bitcoin price going drop.