Well, I can tell you that at my current job we had something of a crisis over the summer when we realized that nobody could make changes without fear of breaking things anymore because we lost the ability to tell which existing behaviors were and were not safe to change.

Previously the knowledge needed to discern that sort of thing would be disseminated through both design and code review sessions. But plan mode and AI code review largely put an end to that.

So we put our heads together and came up with some new policies about project management and how we use AI, and things have steadily getting better since then.

(Though, in fairness, the one guy who seems to actually enjoy getting paged after hours seems to be having less fun.)