I was already against Slack out of principle, but this is pure madness. Their justification boils down to "some people want to".
We encountered this the other week. I didn't realize this was even a thing up until I saw it happen. It is sort of mind-boggling that they allow this. It was confusing to troubleshoot.
WAT? How does that go, if I try to message @username, where does it go then?
Display name != Username
Yeah they really dropped the ball on this one
I didn't know this was possible. How does it work with SSO authentication? I suppose enterprises can force display names?
To answer myself, yes, SSO plans can enforce display name uniqueness.