Dorsey isn't any different. Why we think that people have an expertise on something way outside of their area simply because they are famous or have done well in a totally different area, is beyond me. But we do it all the time.
Somehow actors can provide great advice in politics (they can't), or social media tech folks know the economy (they don't).
Leveraging fame doesn't leverage knowledge or wisdom.
In general I agree with you, but Dorsey has enough money to be getting good advice.