Investing in Bitcoin and also saving money in our banks are two important things, you can't invest in Bitcoin and don't still have some save in your bank that's very wrong, remember you are investing with your leftover fund in bitcoin which is your discretionary income money you won't be needing for a very long time while the one in your bank account is the one you will needing anytime to sort out your personal needs by getting it back either going to bank or by going any point of sales POS joint to withdraw your money while you still accumulate Bitcoin and hodl so it is much important to invest into Bitcoin and also have some huge saves in your bank very very necessary.
You are not totally wrong in what you say. Both saving money in the Bank and investing in Bitcoin are one of the best financial decision one can take. However, what we are looking at here is which is more profitable?
Saving in the bank is good but it's only savings! There's no room for multiplication or gradual increment. It's like storing your money somewhere for a period of time and going back to pick it up. The only difference in this case is that the store has a name attached to it. Infact in some local banks, they deduct money for even saving your money with them and they call it charges!
The goal of Investment is increase and Bitcoin has proven in the years that it's worth every bit of it. Investment in Bitcoin can lead to generational wealth. Though investing in Bitcoin has it own risk but it's better compared to our local banking system.
I rest my case here.