I worked with a bunch of a Ph.Ds at Google, and my dad had one. I myself have nothing more than a bachelor's, and no desire to get anything more. I've heard and observed that the Ph.D teaches you one crucial skill - how to take a vaguely defined research problem that nobody has done before, where you're not even sure that a solution exists, and make tangible, rigorous progress on it. Your actual doctoral topic as a P…
Interesting, that was not the impression I had from 2 engineering professors at my local uni.
It sounded like I was going to be their assistant in studying their idea for up to 6 years.