And the hardware. Your phone requires much harder power optimization in order to have a usable battery life. Same for size and heat dissipation.
Also politics related to the radio connection. Public cellular is tied to identity. It is structurally hostile to user-controlled, fully open, deeply optimized devices because the radio stack is certification-heavy, operator-governed, and privacy-hostile.
And the hardware. Your phone requires much harder power optimization in order to have a usable battery life. Same for size and heat dissipation.
Also politics related to the radio connection. Public cellular is tied to identity. It is structurally hostile to user-controlled, fully open, deeply optimized devices because the radio stack is certification-heavy, operator-governed, and privacy-hostile.