Google: iMessage for All is easy. And you already own it.


Step 1: Kill Allo. No one ever asked for it.

Step 2: Kill Duo: We don't need it if you read Step 3.

Step 3: Support Hangouts. It does everything you want a cross-platform product to do. It can even be installed alongside iMessage for those people who like to use weirdly exclusive messaging apps. My extended family uses Hangouts across all devices to great aplomb.

I'll consider this my resume submission for the new Messaging Czar position you'll want to throw some money at.