Could you please be more specific about your recommendation ? Which text groups ?

I'm calling the following a "text group":

1. A singular comment

2. For a text submission such as Ask HN, the post contents

A general readability recommendation is to limit your line lengths to be around 45-80 (e.g. [1]).

For websites that just have a singular main body of text (e.g. blog posts, articles), this is easy to do with css rules.

The text on HN comments page is of a bit different nature. Each child comment cascades, there's an indent. So to apply the typography rule of "not too many characters in a line, one would have to apply the css rules per text group*. Effectively a child comment is still getting wrapped with the same column width, not lower.

[1]: http://webtypography.net/2.1.2

Thanks I will reread your comment later. I actually agree with that.

Although not hard limit, if you open HN with the extension on, you can then adapt the window size, and the content width will be around that limit;

That's how I do it for now.