When the DSR (Dai Savings Rate) was introduced by MakerDAO, the Compound team developed a CDaiDelegate to take advantage of DSR (pre governance). With DSR remaining at 0% for such an extended period of time, it would be advantageous for the sake of gas fees to change back to a system which doesn’t enter DSR.
The following are rough gas estimates for a CDaiDelegate vs CErc20Delegate transactions. They are a very naive at just a few of the most recent transactions–a goes on behind the scene, but there is a definite and significant downwards trend.
Estimated Gas Savings:
Mint 262,972 -> 187,459
Redeem 316,559 -> 186,721
Borrow 565,067 -> 320,452
Repay Borrow 335,807 -> 196,837