> I can't imagine that being unable to search a chat and look at who said what and when is useful
It might be the bright side of a dystopia, but this is actually pretty useful in practice. If you can't reference previous chats, you don't have to spend time doing it. Instead, you rememeber you had a chat about how to do X, and then do X however you like, because there's nothing to say that's not how to do it. When someone asks you a question on chat, you don't have to be sure about the answer, unless they're going to use it right away, because they'll just do whatever they wanted after the chat expires anyway. This is freeing, in the same way that an autoclosing bug tracker is freeing.
It might be the bright side of a dystopia, but this is actually pretty useful in practice. If you can't reference previous chats, you don't have to spend time doing it. Instead, you rememeber you had a chat about how to do X, and then do X however you like, because there's nothing to say that's not how to do it. When someone asks you a question on chat, you don't have to be sure about the answer, unless they're going to use it right away, because they'll just do whatever they wanted after the chat expires anyway. This is freeing, in the same way that an autoclosing bug tracker is freeing.