We ran into something similar at heyvid.ai — shipped AI-generated code without a proper review gate and ended up with a subtle bug in our rendering pipeline that took the team a week to trace. Not catastrophic, but it seriously eroded trust in the tooling for a while. Amazon's approach makes total sense at their scale. The honest reality is that LLMs are great at producing plausible-looking code and genuinely bad at knowing when they're wrong. Senior sign-off isn't overhead — it's what makes AI-assisted development actually sustainable.