Hangouts came with SMS and Desktop, iirc - as it was supposed to be an immediately migration from Google Talk. It then later got Google Voice, later got MMS, c

Hangouts came with SMS and Desktop, iirc - as it was supposed to be an immediately migration from Google Talk. It then later got Google Voice, later got MMS, continued to "improve" (feature wise - but was terrible) Messenger - if you're referring to the Android app - was just an SMS app from the start and nobody expected anything more from it