The problem with bank accounts is the banks. The promise of crypto is that you don't need to trust any institution, such as a bank, to keep track of your money.
Bitcoin is better in those unstable currency countries. The market will decide (has decided in some cases). So maybe inexorably bitcoin will be the reserve currency for a large portion of the planet. And at some point there will be a tipping point where it's going to be attractive enough to all other central banks.
It turns an everyday person worldwide into equals with central banks. That's pretty radical.
I'm not even trying to be super-negative here - after all, if it does become a lasting store of value, accepted as money in the long term, then early adopters will be holding something valuable. It could happen. But right now the hype is self-perpetuating.