I agree on their code quality/their coding practices are bad, but that doesn't matter for this context. They (GM) are not software companies, so they don't set

I agree on their code quality/their coding practices are bad, but that doesn't matter for this context. They (GM) are not software companies, so they don't set out to write amazing, clean, modular code. This isn't about writing great code, it's about the culture surrounding release.