Just like we ask designers, engineers and PMs to consider the entire system when designing and building their slice of it, we should also ask the same of ourselves as managers.
Beyond just the inefficiencies in process, siloing is harmful to the product itself. It's why in the last 1-2 years we've seen an explosive focus on style guides and shared component libraries. Designers working in large systems should always be asking themselves: has someone else solved this before me? If not, will my new solution fit in with the global system? If not, why?
Thinking locally within an org creates short term wins that feel good and fast and efficient, but in fact it only accumulates a crippling backlog of inconsistencies and design debt.
Related: The Boring Designer