In one sentence//api.prod... stuffed straight into the logic — no name, no central place, the same value scattered across several spots. The cost: changing one spot means searching the whole repo, switching environments breaks it, and reading the code is all guesswork.
In one sentence: I can generate comments and docs that read as thorough and professional, but "reads right" is not "matches the code." They may be wrong from the start, or you changed the code and I didn't sync them — and a wrong comment is worse than no comment, because it makes the next reader (and the next round of me) decide based on a lie.
In one sentence change one thing and three break, nobody dares touch it, every new feature gets slower — the speed falls off a cliff, and the time you "saved" earlier comes due with interest.