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Slack's uptime's been better than 99.995%. Communication failures due to some guy not reading your email are probably much higher. I don't think the SLAs are a big issue.

https://status.slack.com/calendar

I have four direct channels of communication with my team. Email, phone/SMS/iMessage, gchat, and Slack. Their team SLA guarantees 99.99% uptime, and their status site [1] indicates 99.999% uptime.

Everyone will always be reachable with effort, even in a group setting. Slack isn't an infrastructure critical component (such as Github or AWS) where 0.001% downtime would effect my business. Slack's utility far outweighs the prospect of a few hours (max) of downtime a month.

[1] https://status.slack.com/calendar

Oh, c'mon. Email is hardly bulletproof and it's fine. SLAs are almost worthless. You really think a few bucks to a handful of whiners is going to change a company's uptime approach? No way. SLAs are for old school, fat cows who are always looking for someone to chew out.