I have a Pixel phone and run GrapheneOS on it. No Play Services, no Google apps, only open source software from F-Droid. Works really well.
Same with Fuchsia - its license should allow to make a fully FOSS privacy-respecting variant, and maybe it would be something I could recommend to my friends or family to replace Windows on their desktop for example (if Fuchsia becomes popular enough). At least such option exists, unlike in the case of Windows, so I don't see Fuchsia as a bad thing.
https://source.android.com/devices/architecture/modular-syst...
The information on the link is outdated, it was presented at Google IO that Android 12 will now also ship ART as APEX module.
Most likely by then the AOSP documentation will be accordingly updated.