Add to that existing grapheneos users at best only care about good enough performance and a good camera, the selling feature is security and so a lot less overhead to market such a phone. Those who want the latest features will continue to buy pixels, Samsung, and iphones. The only thing I feel is missing from the picture at a quick glance is a tablet for the few who want a secure tablet device.

"Those who want the latest features will continue to buy pixels"

My friend the GrapheneOS supported devices list is nothing but pixels, including the very latest models. It'll be good to have more supported devices.

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