> There's likely many complicated ancient devices lost to time because they weren't widely available or described in documents that have persisted. You literally run a search engine for marginalia that may not be popular or widely known. It wouldn't take much to knock a lot of that content off the web and be lost to history.

Well that's my point. Not that the greeks had some forgotten industrial revolution, but that archeological records are very limited, and we were a stroke of dumb luck away from never discovering the antikythera mechanism. It raises the question of if we almost missed this, what else did we miss. Not just in greece but elsewhere too.