We are being told the advantage is better risk analysis. Do you believe it?
AFAIC Rocket is the whole reason the GSEs have been pursuing this. Hybrids came from the minds of slick salespeople, not risk analysts.
Online lenders want consumers to be able to pull up their phones and do a cash-out refi or purchase mortgages instantaneously. This would give a big boon to Wall Street lenders, because to do so would limit their overhead relative to smaller banks and mortgage companies who don't possess that capability. Instead of thousands of mortgage operations folks, we are talking dozens of engineers. This is the essence of modernization. They need instantaneous approval on collateral. The hybrid is a step on the way there. It is all explained here: