Here you have Dr. Daniel Rasky, a NASA Senior scientist talking about SpaceX and Elon. Daniel Rasky was involved in specific studies that were comparing operation of NASA and private companies. He also has first hand experience from working at SpaceX and with Elon. He is expert on advanced entry systems and thermal protection materials and he was for example involved in decision to select PICA as a heat shield for Dragon, and he explains how that went with Elon.
https://www.youtube.com/watch?v=MxIiiwD9C0E
Here is Elon answering questions of National Academy of Science members about Starship. He explains in detail why he pushed the team towards steel and away from carbon fibers:
https://youtu.be/da3iF2Np51A?t=951
Here you have another direct conversation with Elon:
https://youtu.be/t705r8ICkRw?t=172
Here is Elon discussing with Sundy Munro mass manufacturing and engineering.
Sandy Munro is a veteran engineer from General Motors supplier and directly at Ford. Sandy Munro is now running a consultancy company that tear downs cars and suggests improvements to wide range of clients from the car industry.