No one is saying "no bugs" NASA level code is required. Basic SQA must however be conducted- factory automation software is not something where you can settle

No one is saying "no bugs" NASA level code is required. Basic SQA must however be conducted- factory automation software is not something where you can settle for low quality as you seem to imply. Something tells me you've never worked in factory / production environments. There are critical safety requirements that must be checked, especially in environments where machinery is operating in proximity to workers. Not only that, but there are huge financial incentives in place to ensure high quality. A bug in an early step of a manufacturing process can cause massive amounts of rework or even scrap, leading to huge losses.