Author here. It's the culture of the site. Like Reddit. Much more critical.
Also, remember that Medium is the platform where the writer writes. Commentators mean in fact to address the author. That helps for civility.
Hi, interesting article. I'm pretty sure he does do tennis :-), but I see your point. Ash Barty also credits her current position with the year she took off to play cricket. There was a study just recently I saw about this - https://www.sciencedaily.com/releases/2018/11/181108110020.h... its about hockey players.
I'm ambivalent about Medium's approach. All in all, I do think that you get what you pay for. FB's negative impact is due to their ad monetization strategy. Medium is trying to charge through subscriptions vs advertising, and pays according to time reading vs. impressions, so is much more aligned with readers than non-subscription media.
I loved the article. I'll be sharing it. The visualizations make it much more digestable and inspirational.
Also, the link you posted to Adams' blog has a messed up cert or something. I'm on Firefox on Android. I'll reach out to him as well.