The Signal messenger and protocol.

This comment reads kind of weird, as if you feel personally snubbed that they "ignored" your concerns when in reality the app developers just had different ideas about what direction the app would go in.

Like, that's totally fine! At the end of the day if you were only interested in a replacement SMS app then Signal just wasn't for you. As someone whose primary interest is the security and privacy guaranteed by Signal not only encrypting messages but also message metadata (something Google's RCS explicitly does NOT do) I'm perfectly satisfied with how it functions.

That said, I don't care about stickers or the weird crypto integration, but it satisfies my other needs and includes a desktop client to boot, so I have nothing to complain about.