I decided to focus on email since it's something everyone already uses and I didn't want to introduce yet another platform people have to check.

I'd like to add additional ways that people can be notified when a check-in has been sent out (for those that aren't great about email), but no plans for anything to deeply integrated with Slack. Monitoring real-time chat can be stressful and distracting, so I actually want to encourage people to move away from that for these kinds of updates.