Always interesting to hear how others do things. There are only a handful of usernames that I know, but when I look for them it's important because (for example) they are the author/creator of a tool. From just a couple minutes ago for example, reading the Elixir post[1] the comments from josevalim are from the creator of the language, and the author of TFA. Not knowing that I think would make the thread a lot different (IMHO in a bad way), but I can definitely see the appeal of anonymizing other times.
Maybe the extension should also randomize the ordering of comments. Because I can infer that the top comment is more likely to be from someone influential in the space.
[1]: https://news.ycombinator.com/item?id=37122006