I'm always concerned about handoffs, because where there is a handoff there is a queue, and where the queue reader is busy it results in a wait (and, of course, every item in the queue waits on the one before it).
So with Platform and Complicated Subsystem teams, how are you handling Stream Aligned teams' dependencies? How are you avoiding queuing and waiting for those dependent teams?
Curious if you are loaning out your people to teams to avoid handoffs, bringing their people into your teams' code to expedite, leaving the code fully open to external changes (with review and refactoring to follow), or just dealing with queues and waits.