That's what Apple would like you to think, but it's not.
No matter what you personally think, by having Apple choose to only send messages using the extremely legacy SMS protocol is the absolute definition of lowest-common-denominator messaging in the least secure way.
It's morally and ethically wrong given that Apple touts how much they care about security and privacy and then forcibly choose to use the worst communication mechanism when dealing with anyone outside of the Apple bubble.
Just like the blue/green bubble psychological drama, it would be like emails going out from Apple being unencrypted by CHOICE. They don't even try to interface with RCS to make it secure (or in email: using TLS) -- and that's being absolutely hypocritical to even the Apple customers who send messages to Android as the security is lost.