Just think of all the bloat in a browser. Don't mistake size for complexity. Graphics/game engines are complex. Browsers are big. Whilst true, your simple rend

Just think of all the bloat in a browser. Don't mistake size for complexity. Graphics/game engines are complex. Browsers are big. Whilst true, your simple renderer analogy does not work because it is like me saying that if I can create a program to draw some scrolling text then I can create a browser. I presume you have not had to optimise GPU graphics code whilst maintaining compatibility on multiple GPU vendors with a common code base? One game engine is not the same as another and therefore not suitable for bulk comparison with any particular thing. Each game/graphics engine has their own set of requirements, and quality level, and the level of understanding required to "understand" what is actually going on.