[dev-slash-zero]

Produce useful work, and nobody cares about whether you played by the rules of society.

If you cannot effectively convey information to others, then, I'm not sure you are a polymath. This skill is the same skill that you should already be using to consume and comprehend information to begin with, so it should be second nature to you.

And, go ahead and go through life thinking "I am a polymath, but, I feel no need to prove it either directly or indirectly through the work that I do." If that's the path that you take, then, enjoy being completely indiscernible from everyone else, and thus effectively lying to yourself to feel special. Because you can not even trust your own perception of yourself except through the work that you do -- this is the litmus test that avoids large swaths of cognitive bias if you can pass it.