Some of these are pasting over product weaknesses: - inability to change private channels to public "as you might accidentally reveal secret info". Yes, but that's _my_ decision, not Slacks. - more than 1 or 2 active threads/channels is extremely painful and very easy to lose your way - whilst search is good, finding a thread from just a day or so ago can be very difficult (especially when there are many channels) - abuse of @here, @channel - this only seems controllable at a workspace or org level, not a per-channel level.

Yes, email and ticket systems have drawbacks, however slack is almost an anti-knowledge base in it's current state.