What do you think deleting your HN account would accomplish? All your comments will still be there, and likely backed up by Google Cache, the Internet Archive, HN Search, and anyone else using the HN API.
"Delete my account" may be feel-good symbolism but AFAICT it rarely if ever makes a real difference to the subject (other than emotionally).
"Delete my account" may be feel-good symbolism but AFAICT it rarely if ever makes a real difference to the subject (other than emotionally).