That's one role, as a software architect I also often served as the sunk cost fallacy bad news delivery system. It's a good idea to keep some eyes from outside your team on your project just to do the occasional sensibility check.

There is also a large responsibility to make sure different teams are well coordinated and not building the system in directly opposing directions. It really fucking sucks to have your work, as a developer, invalidated by someone else's work suddenly without any warning.