Look at the term Theory of Constraints https://en.wikipedia.org/wiki/Theory_of_constraints. There is a "business fiction" book called "The Goal" by Eli Goldratt that is pretty approachable. He actually wrote a number of books at different levels of detail. Initially the concepts were addressed for manufacturing ops, but there are some fundamental similarities for scaling software teams, focusing where you produce value, and where you can create waste and misfocus if you try to keep everything/everyone busy at 100%.