Fair challenge—and the last question is the one I can actually answer with data.
The gates fire constantly, and the firing pattern turned out to be the real story. One example: the Spanish edition of Book 2 (~119k words). A first-pass audit rejected 46 of 55 sections, finding 188 confirmed defects—137 of them silent multi-word drops introduced by TTS. Aggregate WER looked acceptable, but word-level alignment exposed the failures. Running the same workflow on Portuguese found 140 defects, while French had only 4. Same orchestration, same prompts, same models—very different error profiles.
That led to two important lessons. First, the failures that mattered were often invisible to the layer producing them, so we combined transcript, acoustic, and alignment-based gates. Second, the gates themselves need validation—ASR can hallucinate defects, so a re-render is only triggered after a second VAD-filtered verification pass.
So I'd refine my original claim rather than double down on it: orchestration's advantage is really model error rate × gate visibility. Better models reduce the first term; better orchestration improves the second. In my experience, the second is still the more underexplored lever in production systems.
And yes, I agree the frozen-graph experiment is the right next step. Translation is probably the cleanest stage to test by holding the graph, prompts, gates, and scorer constant while swapping only the model. I'll run that experiment—thanks for the suggestion.