[lotyrin]

Who reviews, if the mob consists of everyone? If I participated in developing a thing, I would have probably already made the oversight, wouldn't see an issue.

That raises an interesting idea, you split the team, the mob and non-mob, like learning vs testing data. Dedicate some fraction of the team to the mob, then rotate out members. It seems like most of the benefits are realized, if people need skills or compassion for other roles of the project expanded, they get their turn. If the team is large enough that the mob is a minority, you minimize the effect of downsides.