I disagree. While the video isn't representative of a true work team, I know plenty of companies handling communications via iMessage and FaceTime. Keep in mind that many businesses using Apple communications methods are outfitting their staff with those devices.
Plus, Zoom had security issues and Hangouts? I can't even get it to work on any of the paid GSuite accounts I manage.
Since March, I've attended four Zoom meetings to the scores of FaceTime meetings. Slack is great, and I'd love to get my clients to use it, but they're all about using single spaces for communication and most often resort to iMessage. I hate using iMessage to that limit, but at least I can export all the messages and turn it into actionable tasks.