I'm all for Graham's pyramid of disagreement: we should focus on the core argument, rather than superfluous things like tone, or character, or capitalisation.
But this is too much for me personally. I just realised I consider the complete lack of capitalisation on a piece of public intellectual work to be obnoxious. Sorry, it's impractical, distracting and generates unnecessary cognitive load for everyone else.
You're the top comment right now, and it's not about the content of the article at all, which is a real shame. All the wasted thought cycles across so many people :(
It's the new black turtleneck that everyone is wearing, but will swear upon their mother's life isn't because they're copying Steve Jobs.
Sam still uses capitalization in all of his essays, as do most people (including young people). In essays, like this one, it's distracting without it. I predict in 10 years the vast majority of people will all-lowercase on places like Twitter but almost no one will do it for essays.
Maybe he should consider there are different registers of language, and code-switching is a thing. This now increasingly applies to written language, not just spoken language.
Writing this way in structured, formal discourse would be equivalent to a CEO using internet memes and trendy slang in board meetings.