Andy and Mon-Chaio contemplate how often team boundaries should change, what impacts changing boundaries has, and some tactics for making boundary changes easier.
Forming, Storming, Norming, Performing - https://en.wikipedia.org/wiki/Tuckman's_stages_of_group_development
Amy Edmundson, Teaming - https://www.amazon.co.uk/Teaming-Organizations-Innovate-Compete-Knowledge-ebook/dp/B007MF3BRA
Dunbar’s number - https://en.wikipedia.org/wiki/Dunbar's_number
Matrix management - https://www.liveabout.com/matrix-management-2276122
XP central tenant - https://martinfowler.com/bliki/FrequencyReducesDifficulty.html
Gore - https://www.fastcompany.com/51733/fabric-creativity