Cross team communication is hard. When a bunch of two-pizza teams with lots of dependencies between them spend a lot of time coordinating to avoid stepping on each other’s code (due to the merging of the different teams’ code branches), the benefit of the small team diminishes. Smaller teams can increase integration costs. We like small teams because they can move fast. Just realize that by moving fast as an individual team, you may be paying the price of not moving very fast as a whole organization.
FAST solves this
