This is cap. I worked on heads up glasses, and one of our issues was the lack of integration with Apple's iMessage ecosystem. Device makers are willing to go through several security measures, like deploying the MFi chips and certification. However, at best this gives you access to the notification system, not iMessage itself. You are able to respond to messages via the notification framework, but not integrate directly with iMessage even after taking all security and certification efforts. This isn't a security play. This is a walled garden play.