Let's say it's like Slack + Zoom, but it ends up used for things that would have made way more sense as a Lemmy/Reddit/old school forum. You can't find anything old without pausing the scroll, the interaction is piss poor because nothing is visibly sticky for more than a couple of hours even on a slow channel, and then because people (rightly) feel that it's more like a chat, the feed fills up with low effort nonsense and dick-baggery.

In my company, Slack is useful because we're all stuck in front of it for 8hours+ per day, we're all incentivized to be on our best behavior, groups are mostly manageable in size, and to the extent there's a social aspect, it is to replace "water cooler talk" which was always light and ephemeral anyway. It works... fine. I don't love it, but it works fine. Zoom too.

Discord is also fine for what it is, but it's terrible when it's the only public facing option for sharing information and fielding questions about a project or topic.