Was that so hard?
"If you don't want your messages going via iMessage, Settings -> Messages -> iMessage -> Off. Was that so hard?"
I think it's you that are missing the point.
It's difficult to adjust the settings if (for example) the iPhone was accidentally dropped overboard and replaced with a non-iPhone phone. And it's not 'going', it's the incoming messages from other iPhone users that are the issue.
I can't explain it any simpler. Keep re-reading it until it clicks.
Biting the hand that feeds IT
