Barr was right about politicians making the decisions rather than "topical experts".
Consider this, on a building construction site, if a worker ONLY asks the hammer what to do, EVERYTHING is going to be pounded into oblivion. The worker must ask the hammer, and the saw, and the plane, and the square, and the jig, and the plum, etc. They all have a valuable and necessary role to ensure a high-quality build. But only the worker who has an understanding of it all - the BIG picture - can put all the tools to work correctly.