Since his "position" involves advocating for a whole bunch of literal and figurative moon shots, investing in public speaking skills is a HIGHLY efficient use of his time.
And yet there are two companies that live stream product launches and get lots of media attention. Apple and Tesla/SpaceX. So I would say his public speaking skills don't matter to the crowd of engineers and geeks. Maybe, just maybe the product speaks louder than the words?
I totally agree. The first couple of times I heard him speak, I was like "get some skills". But now I can filter out the stutters and delays. And the payoff is huge - the guy is totally brilliant and inspirational. I can see why his employees give it 150%.