I assume that you have undertaken some engineering tasks in the past, and so then you have surely experienced that research, proper selection and setting up the

I assume that you have undertaken some engineering tasks in the past, and so then you have surely experienced that research, proper selection and setting up the sourcing chain for the parts is a big chunk of decisions that go into engineering a production line or even a single project/machine. Research that ultimately affects the choice of mechanical and otherwise building of the machines itself, because it depends on which parts are viable to source. So not sure why you would focus on that superficial difference here, like what are you trying to prove? I don't understand your point. Elon Musk has a lot of results behind his companies to prove that he can engineer and a good ratio of technical terms and numbers he can spur off the top of his head in an interview to prove that he is not even mainly marketer, his brain is in engineering, he knows the technical stuff deeply down to revision numbers and decimal points and can give you an educated opinion on technical matters. So this shows you that he is indeed an engineer, not sure if that's your point even though?