Technically competent is a big grey zone IMO. For example, I am sure Musk knows the details, limitations and technical aspects of the welding that takes place a

Technically competent is a big grey zone IMO. For example, I am sure Musk knows the details, limitations and technical aspects of the welding that takes place at SpaceX, but my guess is he isn't competent to do it. That same example could be used for most of technology. I am sure Musk understands ML at a pretty solid level, but ask him to build or train a model and my guess is he wouldn't show "competence". I think technical competence is also different then "could do it", e.g. I think Musk, Zuck could sit down and figure out most software related tasks. But it isn't a good use of their time. They have a good enough understanding of the technical limitations and requirements to lead people in product creation which has proven immensely valuable.