For me i have bank account for my fiat that i invest for long term because it is much secured than my bitcoin which is i have investment but only portion of my money and i will keep it for short term.
Yes, both are having their respective roles and I think still good. I'm using bitcoin to trade and make a profit. I also use a bank if I want to use the results of bitcoin by transferring it to make money atm and then used for my purposes. I prefer to keep money in banks and invest in bitcoin.