And really only an expert in the things that FAANG companies do. Granted for a place like Amazon that's potentially a very broad space, but it's still a small slice of skills compared to the world where software is ubiquitous. Among other things, zero preparation for safety-critical software. An attitude like "move fast and break things" would end up being "move fast and kill people", and that's kind of a drag on your career. (Insert long discussion about trolly problem and how self-driving car researchers are justifying their crappy algorithms)