It’s not about being pixel specific. They built high security OS that uses HW components to deliver that high security. It can’t be delivered without them. These components are not google patented nor does GrapheneOS demands they use the exact pixel ones. GrapheneOS just refuses to lower security to support phones that lack these components, because manufacturers wanted to save maybe a $1 per phone by not including them at the expense of user security.
It’s not about being pixel specific. They built high security OS that uses HW components to deliver that high security. It can’t be delivered without them. These components are not google patented nor does GrapheneOS demands they use the exact pixel ones. GrapheneOS just refuses to lower security to support phones that lack these components, because manufacturers wanted to save maybe a $1 per phone by not including them at the expense of user security.