I just got my Pixel 9a and put GrapheneOS on it. The only thing that seems to not work right now is KDE Connect, but I'm unsure if it might be me doing something wrong rather than being impossible.
I just don't like to be forced to include the damn year everytime, and if you cut the year from ISO 8601 you get the american MM-DD order, which everybody hates.
I check for all apps on f-droid first, play store second.