Maybe it is, but I am not interested in camera at all unlike GrapheneOS

Not sure - maybe the newer ones?

I bought the cheapest one I could find just to try out Graphene. I liked it enough to ditch the iPhone and I'm still using it a year later.

I don't really care about the camera personally though.

Probably if you run stock Android and use Google Photos the Pixel Camera experience is more powerful.

The FOSS options for gallery+image editing and filters are pretty poor imo.

Overall, the iPhone > Graphene transition requires a lot of adjustments but the freedom gained is immense.