The article itself was a bit disappointing because it focused on political issues. In my opinion the strength of HN in this regard is that it is both a "sjw cesspool" and a "haven for alt-right", as evidenced by the fact that a comment on a controversial topic can easily float near zero points while raking in both upvotes and downvotes. And even those who refer to it as "the orange site" still come back and comment. In other words, HN may be an echo chamber but it is a pretty big one with a lot of voices in it.
I'm not saying HN should allow ALL political discussion, but when technological issues inevitably and undeniably involve politics, either by influencing or being influenced, it seems a little cowardly that the general attitude of HN is "just don't discuss it" when the it in that case is core to the issue at hand, even if it happens to be political.
Is there evidence that arguing politics over the internet is causing a net improvement in the world? I'm inclined to think political discussions on social media are causing political dysfunction, not fixing it.