If a computer in 1993 could run DOOM, a Raspberry Pi with 1GB RAM and 1.2GHz CPU (MUCH MUCH more capable than a 1993 PC) should be possible to transform into a game console that can run my simple 3D games. The fact that the Raspbian OS can barely render a website is the OS's problem and not mine. A computer that capable CAN run advanced 3D games.
I just have to learn to program "bare metal" for the Raspberry Pi.
You can buy a used Raspberry Pi for $20, imagine a cheap game console that weighs nothing, that you can plug your keyboard and screen into, and play games with graphics on a 1995-2005 level?