Google changes its messaging strategy again: Goodbye to Allo, double down on RCS
Its shocking how Google is embarrassing itself with these incompatible chat apps released one after another and abandoned right after the release. 
GTalk
Gmail Chat
Google Voice
Hangouts
Android Messages
Allo
Duo
for fucks sake Google, just copy Whatsapp but make it stored on cloud, not on the device, like FB Messenger. 
Enable account recovery using email in addition to sms and enable usernames or email in addition phone number to add contacts.
Thats pretty much all you need to do to beat the competition thanks to your android influence