I don't. Once there are more than a certain number of comments, there's a diminishing value to additional ones because they start restating what's already been said in other comments.

You are not required to read every comment on a HN submission.

Check for links using ctr F or something and yes no one can read all the knowledge in the world nor all the books in the world. We just read what we can

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Scan for high signal or value comments, read a subthread, collapse the subthread, as a "read" indicator. HN stores state in this regard for you, if logged in.