I’d rather be operated on by someone who is an expert at brain surgery who may not be able to do these things than someone who can do these things but is not an expert at brain surgery.
My point was that Heinlien’s quote is typical of many maxims and epithets. They sound good at first, but when you analyze them, they usually don’t make complete sense.
I’m glad you’ve made so many accomplishments. I agree with you that we ought to study and excel at all those things we love to do. But we also have to admit that some people are better than others at certain things. Relatively, like it or not, they are experts or specialists, and they are the ones we depend upon in critical situations.
You obviously have never been a single handed sailor, or a mountain climber, etc! While even us single-handed sailors defer every now and then to a specialist out of convenience, it may not mean we couldn’t’a done it ourselves! His message stands as written, elitism notwithstanding!