"Working with the experts" always turns into weird formalized brainstorming sessions or other rituals, where the designer defines the process and the rules, and others' role is just to be little players in the game, but not the referee.
This is nothing new. We have seen the same thing with PMs and "scrum masters" inserting themselves into the software development process with shit like Agile, Scrum, etc.
If design thinking is just a problem solving approach, experts and practitioners in the field are perfectly capable of doing that. We don't need the shamans of Design Thinking to guide the process.