Slack isn't treated that way. It's not the same as a hallway conversion. There's no record of a hallway conversation and no way to search or reference a hallway conversation. It's therefore impossible for anyone in a hallway conversion to think other people could do those things and therefore they don't act as though others could do those things.
Slack on the other hand those things are possible and because they are possible many people expect their conversations on slack will be/must be referenced. You can claim all you want that's not what they should do but it's empirically what a large percentage of slack users actually do
That's fine. They can do that, and then complain about it. If they happen to listen to me they'll be happier and not annoy everyone by complaining about features.
Slack on the other hand those things are possible and because they are possible many people expect their conversations on slack will be/must be referenced. You can claim all you want that's not what they should do but it's empirically what a large percentage of slack users actually do