So would the bootloader also include a rudimentary GPU driver to, for example, display the Apple logo, the boot device selection screen, the internet recovery U

So would the bootloader also include a rudimentary GPU driver to, for example, display the Apple logo, the boot device selection screen, the internet recovery UI and so on? One would think that they would've provided a simple framebuffer interface in the hardware for this kind of use case. (I'm more of a software kind of guy, I might be entirely wrong here tho)