Guess i'm in the minority of users here who loves this app and really wanted a facetime like thing on Android. Hangouts work, but it's heavy and not a good experience overall. And facetime is ios only, so Duo will definitely bridge this gap. I read on a Verge's article that Google wants to make Hangouts enterprise focussed by integrating more into the Google apps and keep Allo/Duo as the consumer focused communicatio…
This makes a lot of sense: there are some big differences in the experiences wanted by these two groups.
Edit: and there's a whole story about that: https://www.engadget.com/2016/08/16/google-hangouts-business...