what about the traditional offline wallets . they can also be your own bank because some of them offers interest rates when you save on them but why there are still banks ?  you can ask that here on bitcoin , we still also need a bitcoin bank because a wallet cant do all the service alone  . banks still have other use or purpose that cant be find anywhere  .

by the way , i can see that last reply from this thread was on dec 2018 , that was a bit long . nice digging for the ones that digs this .