That seems inherently contradictory? Particularly if you put some cost on a) not being able to merge and build on the feature in another branch, b) disturbing someone to do something perfunctory
It is an inherent contraction. Having good testing and fast flow is a contradiction. The advantage of a second set of eyes is simply a sanity check... from a second pair of eyes. It's all a balancing act, but it does prevent a large set of failure classes that are basically "This dude went crazy"