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To be honest @needcreations_, you sound quite entitled in your arguments against this @delete feature.
You don't own the content of other users. People are here because they want to. If they (or you) want to remove their content, it's theirs to remove.
If SN becomes hostile to some kind of users, they would probably not post at all. And I think that's worse than someone deleting their comments after some time - even if it's just seconds.
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Stacker News is a public forum, not a dm group among friends. You're making an apples to oranges comparison. Of course posts will lose value if fragments of the discussion are auto deleted. Nothing will make sense to the reader. I don't value that at all.