Thanks! Indeed, the variability of size and usage of each instance was the big issue, and then doing features that crossed instances meant they'd be crossing sh

Thanks! Indeed, the variability of size and usage of each instance was the big issue, and then doing features that crossed instances meant they'd be crossing shards whatever they did, so it made sense to fix the variability issue. (I'm also surprised/reminded how fast Slack grew and how quickly it became effectively ubiquitous — I think every company I've contracted for in the last five years has used Slack).