While frustrating, this isn't limited to Steam. Incremental issues popping up sounds just like most review processes I've seen while in the military. One person looks at it and comes up with recommendations. Once those are dealt with, it moves on (possible up) the chain to the next person, who finds other issues, etc... The fun part in military reviews is that eventually you get to someone who wants you to change stuff that was recommended by an earlier reviewer.
Mike