[lostcolony]

Someone messaging on Slack can be ignored quite easily, without it being rude. If someone is starting a video call with you without arranging a time with you first then I agree you need to get in physical proximity with that person, but only to smack them.

Slack is not usefully searchable, true, but its purpose for documentation is not nearly as bad as you make it out to be. If you have a link to the conversation you have the whole conversation; that can be useful to share context. Likewise meetings; being able to record them is HUGE. But either way, you mention Slack should only be used for ephemeral communication...all in person communication is ephemeral. Slack at least has it saved, even if it's a pain to find; in person does not. I can share a Slack link; if you missed it, forgot it, or disagree about what was said, you're out of luck with in person.