We All Have Portfolios; Everyone Is a Strategist.
The complex systems approach is that vision, strategy, tactics, and execution exist at each level of the organization. The only things that change are the scope of the options and how we want to handle the division of labor.
How Do We Keep the Business Agile and Aligned?
We need purpose-driven units that can align themselves horizontally. The only reason to have management layers is when managers see themselves as caretakers of purpose-driven (sub)systems.
What Group Types and Sizes Work for You?
Define common group types (depending on context). Understand what drives people in which groups. Figure out which common group sizes work for you.