I guess what you said is right - the starting code and the later refactored code for reuse is and should be different. You experiment a lot …
Anyway after reading I still struggle. All these discussion is about game. I am more on simulation like Game Of life but in 3d (2d done using sdl and except iOS-mixer, one code base can run on most platform I care about). And possibly VR. May be back to unity and … learn so much using c/c++ using sdl especially just pass grenderer and gwindow around and just use function pointer. I guess 3d is out of reach based on reading your article. Very enjoyable reading nevertheless.
Anyway after reading I still struggle. All these discussion is about game. I am more on simulation like Game Of life but in 3d (2d done using sdl and except iOS-mixer, one code base can run on most platform I care about). And possibly VR. May be back to unity and … learn so much using c/c++ using sdl especially just pass grenderer and gwindow around and just use function pointer. I guess 3d is out of reach based on reading your article. Very enjoyable reading nevertheless.