I don’t get it – Google Allo Review

So google has hangouts with both video and chat baked in. Now they have Allo and duo. Separate app for message and video. I don’t get it. So why won’t I just use hangouts? Why download 3 separate apps that hangouts can do? Seriously google? This is why Apple beats google for social media interface.
Review by GGGG1970 on Google Allo.