Pixels are the only devices providing the updates and hardware-based security features required by GrapheneOS. Motorola and Qualcomm are improving their hardware so future devices will all of our requirements. Motorola will provide us what we need to provide proper updates and is helping us port to their devices. We'll have their support to keep it working well. GrapheneOS needs a lot of hardware related work for our security features.

Our hardware requirements are listed here, but our features also need to be ported to the hardware such as getting hardware memory tagging working for the whole kernel and userspace:

https://grapheneos.org/faq#future-devices