Not saying we don't deserve that sort of time off, but it seems somewhat excessive given the circumstances.

I've burnt out myself, and it's no joke. I wish him only the best. But to me the real risk here isn't "senior leader out for long, possibly indefinite period". It's "Tesla has been running a sprint, not a marathon." If somebody this high up is burnt out, what's it like for everybody else?

Given Tesla's precarious cash position this is the time when they really need for things to go smoothly. But if people are at or near burnout, they'll be making mistakes, cutting corners, etc.