1. An ability to trustlessly hold and release digital collateral on an entirely peer-to-peer basis. This entirely removes the necessity for a whole class of middlemen that seek rent for existing lending agreements. 2. An ability to trade one's ownership in a loan as a cryptographic token -- again, something that necessitates various paying agents / clearing houses / intermediaries in the traditional capital markets ecosystem.
Re: decentralization -- that's a fair point. Right now, Dharma is functionally a centralized code base controlled by a centralized set of contributors. In the future, however, we hope to transition to a decentralized governance model so that the protocol can serve as a piece of common, shared public infrastructure -- unfortunately, we don't have robust enough decentralized governance models quite yet in the crypto community.