To be explicit, there is absolutely a place to “shield the team”, but I’m talking about a pattern I’ve observed that many managers will use that as a pretext to avoid keeping people in the loop and essentially get to boost their own career by holding others back. Real shielding is when you politely tell team Y that their proposal is going to require your team to have to own and operate a net new production service, not when you make critical decisions without consulting some of the biggest stakeholders - your own team.