This nugget is super simple and might not apply to everyone, so I’m going to keep it short. Running a large organization is different than creating and building one.
Running something which is established requires someone who is good at complex decision-making, prioritization, organizational design, process improvement, and communication.
Building an organization requires more skills relating to hiring, personally executing, being an expert in your domain, quality control, creating processes from scratch, and initiating new directions.
There is obviously overlap, exceptions, etc. You can find holes in this, but from 30,000 feet, I thought it was insightful and worth capturing.