Thank you. :) Unrelated to the OP: This has surely come up before, but I haven't seen it while I'm here: why does HN not auto-link URLs in the submission (wit

Thank you. :) Unrelated to the OP: This has surely come up before, but I haven't seen it while I'm here: why does HN not auto-link URLs in the submission (with rel="nofollow" if there are SEO concerns), instead of relying on people making "clickable" posts?