It's very similar, you leave thrash around for others to deal with. And it's just not "one's online content", you also degrade the online content of the ones who spent time replying to you and participating in the thread.

I mean it's quite simple. It serves the user at the cost of the community at large.

HN has similar problems because you can edit your post after people have replied to it. This means you can retroactively change history and how prior arguments were framed, which can make other people look like idiots or completely destroy a comment chain.

If you're really concerned about anonymity or your history being used against you, then create throwaways. Otherwise you're not stopping corporations from keeping tabs on you, the moment you hit post that data's already been scraped and stored somewhere.