Pretty comparable is "Developer Advocate". The job is to grease the wheels between people using your services and the developers developing them. In that role, they playact as both customer and provider, both to developers and consumers. An awful lot of Developer Advocates are mediocre at both, but you don't need to be good; In fact, in some ways being mediocre is a plus, because the point is to represent each side to the other.

Whereas, the people who have done great things and spend their time on brand instead of "Doing X"; Often they are coasting on reputation, but it's a form of retirement for them. They still like X. They still want to do X, but as a hobby, and getting paid to talk about X and get others excited about X is like having your cake and eating it.