Having just gone from an iPhone as my main phone to a Pixel with GrapheneOS, GrapheneOS is such a breath of fresh air. No constant push of AI, iCloud services, etc. plus I actually feel owner of my phone and not living on some feudal landlord's plot.
If by fine you mean "they work," then sure. But since it is a closed platform controlled by Apple, you are always one law away from client-side scanning of your conversations, emails and any other content on your Phone. Of course, this will be done to "catch terrorists and protect the children," and Apple will obviously comply.