Slack messages are annoying, mostly go unread. Slack has no way of prioritizing or organizing itself. I've become more and more disaffected by Slack over time as a way of doing work. Instead, I prefer these other ways of async work, where it's tracked more permanently, and the tooling is built for a certain type of interaction. I view slack as work social media, a kind of ephemeral place or community. A place, at most, to share an idea with no commitment to get a response.