This is interesting. Most of the time I have issues to discuss with colleagues I message them, which ends up in a 10-mins back-and-forth on-and-off message exchange and then the scheduling of a call. I will definitely give this a try.

I’ve had several projects recently involving many short clarification/discussion calls, seems useful for that once the functionality is more baked out - cool idea!

How is this different than just hitting the call icon in Slack? Then I even already have individual or group calls ready to go in one click.

On Slack, you need to wait for your colleague to accept the call. We want to give users the option to be in an "active" state, where they immediately can talk to each other. If I am working on a project in XCode for example and want to ask my coworker about an idea i have, I don't have to switch apps, search the colleague, press call and wait for them to answer. I just move the mouse to the menu, see that they are active and I am instantly connected