I mean, who’s going to verify the code? And then there are new nightlies every day. Sure they don’t contain that many changes, but you’d need to monitor them, for every rom on every phone. Well, maybe just for the one rom and the one phone model that interests you but that’s still not feasible if it’s not a paid full time job. If someone were to do that on their spare time they wouldn’t have much of that left :P