That's all very true, I agree. But my point wasn't that they're good at what they do; my point was that they may still be better at it than we are for ourselves

That's all very true, I agree. But my point wasn't that they're good at what they do; my point was that they may still be better at it than we are for ourselves. You wrote "If you disagree with me about what's in my best interest, it's far more likely that you're wrong than it is that I'm wrong" - and it's not obvious to me that that is more likely.