When it comes to writing, I think the biggest factor that determines if/what/and how you write is the audience you imagine. When you write, you sort of picture yourself telling the story to someone. And the way that scene plays out in your mind depends entirely on who that person is.

If your mental image of the audience is "some random Internet user whose interests are different from mine", then you can't imagine them standing there patiently while you laboriously walk through all the details of your renderer. So you don't.

But if you imagine an audience that is "another retro renderer enthusiast who has similar projects", then you can imagine them getting hyped up by what you're saying and gleaning bits of useful stuff from it that they can apply to their own side projects. It almost feels wrong to not write it and let them down.