My original reply to the OP’s question, thoughts and experiences with GrapheneOS, was along the lines of “I think GrapheneOS is Google-centric” and you disagreed saying that GrapheneOS was a “blank slate”. Honestly I think you’re being a bit defensive and maybe a little gaslighty which is why I downvoted.
GrapheneOS provides fairly prominent links to a Google Play installer or the relatively obscure Aurora Store. The Aurora Store client app is FOSS but the store is quite literally a proxy for the Google Play Store. The apps in the screenshots on Ausora Store’s homepage are mostly apps that use or require Google Play Services. This is all very Google-centric.
If Google Play wasn’t an important part of GrapheneOS, it could just not contain a prominent link to the Google Play installer. Or it could contain a link to install a fairly prominent app store that offers an ecosystem outside of Google Play. But it exclusively steers users to the Google Play ecosystem as a part of the default, packaged experience, hence my original reply to the OP.
Graphene shills have been banging on this point for donkey’s ages. Reality is that many people use phones that are out of OEM support and many OEM ROMs are bundled with questionable software (Oppo, Samsung etc.) There are some decent criticisms to be made about LineageOS, but others to be made about Grapheme, like its Google-suggestive configurations, which is quite bad for security and privacy. Graphene says this is all optional and not part of the OS, but doesn’t include any equivalent F-Droid installer.