> Freedom to hack is the freedom most obviously applicable to educational applications, and you clearly arent getting that here.
Ok, what SoC should they be using? As far as I can tell, no currently manufactured product will meet your requirements.
There is a HUGE amount of room to hack on a system before you get to hacking the video internals.
You don't have to use Linux, you can write your own OS from scratch, you can program to the bare metal if you don't want an OS (making the appropriate API calls to the video chip).
would it be better if the GPU firmware was open as well, ABSOLUTLY.
But to dismiss it as 'worthless' and 'fraudulent' because the GPU firmware isn't open is going too far.