Sorry, but the issue is not the standards for SMS/MMS. Yes, they're old standards, and have size limitations.
It's entirely up to Apple whether to make their iMessage platform available on other platforms.
They've shown they're quite invested in keeping it to running on Apple hardware only by going after and blocking any 3rd party attempt to provide iMessage compatible clients.
It's entirely up to Apple whether to make their iMessage platform available on other platforms.
They've shown they're quite invested in keeping it to running on Apple hardware only by going after and blocking any 3rd party attempt to provide iMessage compatible clients.