graphenediscoverer4 crDroid [...] graphenediscoverer4 DivestOS/LineageOS [...]
It is not likely any time soon that crDroid or DivestOS or LineageOS will incorporate all of the GrapheneOS security and privacy features.
It is also not likely any time soon that GrapheneOS will incorporate all of the crDroid or DivestOS or LineageOS convenience features.
Some code does move among those projects! But at any given point in time individual users will need to choose one OS, with one subset of all known Android features. And probably at any given time the GrapheneOS feature subset will have more of the security/privacy features and fewer of the convenience features.
If you want, you can fork GrapheneOS and port over one or more convenience features. If you end up with a clean and secure implementation for some features, you could submit them to the GrapheneOS project, which might or might not ship them (likewise you could submit to Google's AOSP project).