It is, but no one thinks about the hardware level issues with Google devices. They keep doing illegal spyware and data harvesting stuff, so Google and GrapheneOS in the same breath doesn't feel as safe as everyone makes it out to be.

Waiting for the Motorola handsets to come into play with GrapheneOS in 2027.

Either way - nothing is foolproof. Logging in to the same accounts, same emails from different devices, no matter how protected, is a giveaway anyway.