Basic open-source Android apps have felt outdated for years, and the GrapheneOS team is finally stepping in to fix the problem. The developers are shifting resources to completely replace clunky default software with modern tools built from the ground up.
No, most of Graphenes features are not implemented in AOSP. There are a lot of CVE patches from Graphene that land in AOSP, but it doesn’t have any of the hardening or sandboxing that makes GrapheneOS what it is.