Your corporate culture shapes use of the tool a lot more than the design of the tool, especially when that tool's essential components are identical across the entire set of competitors.

Slack doesn't have some voodoo set of features that make it more problematic than Hipchat or Teams or Stride or Mattermost or (nn programs elided).

If your org sucks, your communication within that org will suck too. Let's not burn down the concept of instant messaging in the name of sucky orgs.