This alone would make me more likely to switch back to iPhone, as much as I hate the walled garden. "Just switch to a private messenger app" doesn't really work when no one else uses them. I've even gotten all of my family to try Signal, but they dropped it in favor of going back to imessage. It's extremely frustrating, far from ideal, but it is what it is.
Google reading my messages at all, even if it's "oPt OuT", is a complete non starter.