Funny that as Discord releases a light theme, Slack releases a dark theme.
But in seriousness, does Slack really have any value proposition over Discord beyond Screen Hero these days?
I switched my organization over to Discord based on the ability to create public channels for testers/customers to communicate with my team on the server without any role-based overhead (also because my target market is largely the Twitch/gamer crowd - most of whom already have Discord set up).
I understand that there are less integrations baked in, but most are easily worked around with webhooks.