The point isn't just to make a game, but learn how all how it all works under the hood. He's stated multiple times throughout Handmade Hero that you probably don't want to make a game that way.
> Don't spend... how many years has it been now, nearly ten? On a debug room that looks like a high school CS project.
If you add all the hours up from every episode it's less than a years worth of work...
Man I wish Microsoft (Apple too!) would just say screw it to new features and spend time really polishing their operating systems. I'm sitting on Windows 10 as long as I can.
Honestly, I couldn't say Johnny. I'm not a graphics engineer, just a hobbyist game programmer who works in construction, but I did so some internet searching and came across some blogs that I found interesting.