Lots of companies have teams for back end, front end, ops, etc. Slack is a good way for things to get lost in the noise or decided by whoever is in the channel

Lots of companies have teams for back end, front end, ops, etc. Slack is a good way for things to get lost in the noise or decided by whoever is in the channel at the time. Email doesn't have those problems but discussions can stretch out over days. And people speak more freely when there isn't a written record.