I used Hangouts and now use Chat in a professional environment, for more casual short form comms, and it’s clear after 6 weeks of heavy use that Chat wasn’t designed for anything more than light usage.
Google Chat is at its best on the mobile app, but if you’re using it regularly, across mobile and in the desktop chrome extension, you’ll quickly see the questionable choices made by the developers. Unfortunately, that’s about where the improvements end. That’s really nice and a feature we were hoping for coming from Hangouts.
Google Chat added the ability to have rooms where specific topic threads can be created.