Why would anyone concerned about privacy use a Google phone?? It's not just the OS that matters, it's the device, too, right? Am I missing something?
Discussion
It's not a Google phone. Baseband and OS get rewritten with de-googled FOSS software. Graphene on a Pixel is THE way to get privacy on a mobile right now.
If your threat model includes not trusting the HW modems, CPUs, RAM then I'm sorry... you're fucked buddy.