Bitcoin doesn't have to beat the banks, they can both co exist. We will always need the loan service that banks provide, bitcoin can't do fractional lending like how fiat money can. You can't just create bitcoins out of thin air, doesn't work like that.
I agree, bitcoin has a very limited function, bank is more trustworthy as they are called a business of trust.
Though bitcoin is more transparent as it's running in a decentralized system, but people still trust banks than bitcoin, we cannot change that reality