63 votesBrett Hinton commented
Please allow for mark all messages in a channel as read - otherwise filtering by unread messages (especially for operational messages channels that bots post could get really noisy - especially after being gone)
We acknowledge the customer demand for Private Channels and have been hard at work on it. Private Channels is currently in preview with a select group of customers. We expect to release the feature to the public later this Fall, and will update here when we are starting to roll out to all customers. We appreciate all the feedback you have provided to us on this forum and thank you for your patience.
~AlexBrett Hinton commented
If you look to solve the problem by re-creating Slack in Microsoft teams then private channels makes sense. Most of the use cases I'm reading below seem to try and do that. Having "too" many groups is not that different than having too many channels. Microsoft actually is giving us a new namespace that we can use in the groups perspective and then having channels within those and that makes things like this more powerful not less from my perspective. We have been using Slack for 2 years at this point and private groups would meet our need just fine.