Every team has its fault lines, a divide where multiple faults come together. If you live near the fault line you know it exists. The further you get away from it, the less important it seems or the potential for harm exists because it is “over there” and not near you.
At any point in time, it’s the role of the Dev Manager to know what faults will trigger these lines to break and fall down upon one another. Because if it does happen, they are the person on the ground looking to repair their damage and help their team get through it.
If you don’t know where the fault lines are on your team, it doesn’t mean there aren’t any, it means you are too far away from them and not paying attention to what is happening to them.