Slack is your spoonful of sugar.

We use Slack for all internal communications. In addition to replacing email altogether, we have Slack channels for projects, recurring meetings, each team has its own channel for providing updates, and of course individual conversations. Canvases support projects, teammates or groups will often huddle in Slack instead of setting up a Zoom, social and affinity group channels keep people connected, and our bug triage is managed through a Slack channel with Jira integration. It would be hard to think of a process at my company that doesn't rely on and benefit from Slack.