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Among the main reasons for the change is a structural limitation of Gnosis: it clears at the lowest possible price where demand meets supply. This means that if A is willing to buy half the supply for $10, and B is willing to buy the other half at $9, the entire auction will clear at $9.
Using the Paradigm system, we are able to run blind auctions, in all-or-nothing format. This helps to create more price competition between bidders and reduce gaming of the on-chain auction system, ultimately leading to better pricing.
As a fee structure, 4bps of the notional volume done by Ribbon go to Paradigm.