They have already announced they will add support for RCS this year (https://9to5mac.com/2023/11/16/apple-rcs-coming-to-iphone/ https://9to5mac.com/2023/11/16/a

They have already announced they will add support for RCS this year (https://9to5mac.com/2023/11/16/apple-rcs-coming-to-iphone/ https://9to5mac.com/2023/11/16/apple-rcs-coming-to-iphone/), so not exactly a protocol released 32 years ago. It’s probably coming in iOS 18 Still unencrypted though, because the RCS standard does not include encryption.