Can’t vs won’t. I have no doubt that they could do it, but apple didn’t get to be one of the most powerful companies in the world by doing the thing that is cheaper for the user.

They won’t use it until they are forced to 100%. iMessage has become a reason people get iphones. Peer pressure at its finest.

You should also put your efforts towards getting apple on RCS. Then you wouldn’t need to have multiple apps.