But really, people are just going out of their way to resolve the cognitive dissonance: they know that important intangible collaboration is lost in a world of remote work, but they prefer it anyway, so they convince themselves that the human aspect doesn't matter.
Also, don't forget that HN is filled with junior engineers. It's true that a lot of what you do when you're a junior engineer can be done in isolation, and when you get to a self-sufficient junior level ("senior engineer" in modern parlance; achieved in about 3-5 years), it's easy to ignore all the times that someone with more experience made a one-off comment that saved hours of labor or headed off a thorny problem. They forget the number of times that someone wandered over to chat, "interrupted" them, and changed everything.
The sibling comment is a great illustration. I can't tell if it's parody, but it reads like it: "just don't have whiteboard meetings about architecture," indeed. Whiteboard diagramming obviously never happens at every company, ever.