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The problem isn’t in the system, but in your expectations.
You’re starting with a wrong assumption that things publicly available on the internet can simply be deleted. That’s not how any of this works.
Maybe that’s our fault. Maybe we weren’t clear enough back when you started using the internets. But It’s true, deleting things online is very difficult. You shouldn’t ever expect it to be simple or easy.
What goal post? There is no actual, technical, difference, between archive and active. As soon as a post is made, it’s old, and part of the accessible archive of past posts and accounts.
A basic reality from the beginning of the internet, is that you once you make something publicly available, it’s out there. You can’t really ever take it back. It’s just a fundamental principal of how the internet works. A lot of people seem to forget that.