This is a huge red flag, in my opinion. A CFO is legally responsible for compliance to exchange regulations, SEC, etc. Reporting is based on judgement, regarding the interpretation of very complex rules.

I would have liked to see someone with external experience that has a frame of reference as to how other companies do things, in a high-pressure, regulated environment; a la Ruth Porat.

Musk is a big personality, with a my way or the highway attitude. Ultimately, I'd feel more comfortable with someone who could unequivocally walk away, and in doing so, would send a huge signal that something doesn't smell right.

In my experience, someone who grew up drinking the coolaide won't have the experience / ability to pull the company back from disaster. Think about all the folks at Uber. It's sad, but you need experienced and ethical leadership, that has an obligation beyond just to the CEO, in Legal / Compliance and Accounting. Especially given the wild ride at Tesla, this is more important now than ever.