If your team can't check on that stuff manually for a few hours while Slack is down, then I think you may have bigger problems.

If anyone on my team came to me and cited Slack being down as a reason for their inability to do their job, then they wouldn't be on my team.

Is it less than ideal? Yes. Is it a little bit less efficient to pull info instead of having it pushed to you? Yes.

Is the sky falling? No.