I don't have a direct answer to the OP, but I have come around to seeing the value of a good life/work coach.
I would have been similarly cynical about coaching as an industry, seeing it mainly as a pyramid scheme, until my wife after a promotion was given access to one through work. The person was a semi-retired former senior manager, and a few sessions with her really allowed my wife to think about her management style, reflect on various issues and personalities arising in the workplace and how they might be best managed, and basically gave my wife some space and tools for thinking strategically. To the extent that my wife went back to her for a couple of sessions about life more generally, and found it really useful.
That said, the coach was someone older with significant accomplishments and knowledge of an industry, and was not just someone who, having gone through life-coaching, decides themselves to pay someone a lot of money to become a life coach.