I'd just like to thank all developers, maintainers and all other involved in this project for such a wonderful experience installing and using GrapheneOS. Polished, thought-out, there is much to like.
My usecase is to become less dependent on Google. I'm using Google Play Store/services on GrapheneOS so I don't know how much it is improved exactly, but it has to be better than pure Google.
A word of warning for people wanting to install the OS and are dependent on Whatsapp; at the moment there is a flaw in the backup system of Whatsapp that won't let you restore a backup (see reddit thread concerning Whatsapp). I'm not dependent on it and it is a good excuse to just quit it and using Signal exclusively.
No fault of GrapheneOS, it's a fault in Whatsapp.