I didn't say this was the fault of Slack. I was answering the question about why multiple instances might exist.
On the subject of Teams, if you want to see something worse than dozens of Slack instances merged into one, it's what happens when those are subsequently migrated to Microsoft Teams, with one team created per Slack channel. Not recommended.
Also not Microsoft's fault. The effectiveness of these tools depends highly on the implementation.
We have slack and teams. Teams is awful, itβs silo based, separate discussions in tiny areas.
Slack means silo walls break down, channels are formed and disintegrate by people with stuff to contribute in an agile way, rather than a team structure which takes years to change.
Now, Teams would have handled this better.
One team = make a team = make channels in the team