Not my area of expertise and so you have a far, far better understanding that I do and perhaps you can put my fears to rest! AFAIK it is only the Geely vehicles (Volvo & Polestar) that have been running this for any length of time and the feedback re AAOS on Volvo and Polestar on their forums has been mediocre (being generous) so that gives me pause. The app integration is poor, the updates are slow to come, and it is glitchy. (Not my opinion, just my reading of the forums which, btw, is the most instructive real review of any vehicle IMO).
My bigger concern is the way Google tends to handle its OS systems more broadly. A vehicle system needs to last 20 years (the typical new car life is about 22 years excluding losses due to accidents). To be effective, an in-car OS needs to be updated with great care to ensure maximum compatibility with previous model hardware. In an EV, the infotainment system is a power hog so it also needs to be carefully implemented to manage consumption. AAOS is a generic system not designed around specific hardware and there is little incentive for Google to ensure all future iterations are optimized as much as possible for earlier hardware or to keep older versions up-to-date. The phone android software track record is not encouraging on this front. (And then there is the whole business of giving a bunch more of your life data to Google issue, but I will skip the tinfoil hat stuff!)
I know that Ford is moving to AAOS beginning in 2023 and GMC is using it in the Hummer EV. So perhaps it will improve. But as I said, it makes me anxious that as a result of using AAOS Fisker will not be able to roll out updates in a timely manner or be responsive to the inevitable problems and feature gaps that owners find. But I very much welcome correction if my impressions are misinformed.
