Why does the human core stay stable?#
Because shared context and trust take time to build, and machines do not hold them for you. A team that reforms every quarter spends its first weeks rebuilding an understanding that a stable core would simply have. The machine capacity around it can change freely; the people cannot, without cost.
How is it sized?#
By judgment load, not work volume. The question is how many consequential decisions this mission will generate and how much understanding each needs — not how many tasks there are. That is what decides whether a mission needs two people or six.
Specialists join for particular decisions through a specialist judgment service, rather than being embedded in every team where they would be idle most of the time.