it's not needed, but transfers using smart contracts could be more convenient than in other ways. It doesn't have to be a zero or 1 proposition. It's like saying cloud is not needed because we can do it on the desktop
ok, so say I need to distribute payments. If I transfer money to a wallet and then a smart contract automatically takes care of sending the right amounts to the right wallets, it could be more convenient than current payment distribution solutions, no?
You still need to be able to transfer the loan from party to party, and allow parties to prove ownership of the loan. That's not a complex contract obviously, but it's important.