the most critical part of being a great engineer is the "economics and finance" knowledge and the application to real products with a substantial TAM ... otherwise you are just a hacker ... i have worked as a systems engineer for 35 years and most "engineers" are actually hacks and dont do the economics, therefore there designs dont get beyond prototype ... based on the fact the Elon trusts Zach as Tesla CFO and Elon has been mentoring him to his approach to design and engineering i think he has the aptitude to become an excellent CEO ... he might need a to do tour in operations first however...Well, in your post I replied to, you quoted Wikipedia as saying: "From 2002 to 2006, Kirkhorn studied both Economics at The Wharton School and Mechanical Engineering and Applied Mechanics at the University of Pennsylvania as part of the Jerome Fisher Program in Management and Technology. In 2013, he received an MBA from Harvard Business School."
That excerpt omits he BS in Engineering, so it was unclear as to if you were aware he had such.
Now if its your opinion "an undergrad degree doesn't make you anything beyond possibly ready to begin a career in your field of study", then so be it.