"Or it was a quick hack to get the job done & meet an alpha or beta release deadline - and after that manglement never prioritised a fix"
No, no, no. This isn't a minor fix. This software implementation means lots of dollars not spent on hardware to clean up emissions. It's a very big deal, and a huge competitive advantage over other car companies. Savings in cost and improved in-field fuel economy mean a double-dipper helping of good news. Think of all of those conversations between car owners about fuel consumption, and the smug VW owner who seemed to get "a bit more" out of a tank than anyone else, quickly followed by the classic "well that's German engineering for you".
No, this isn't a minor hack to get through a gateway. This is more like the comment "This kind of thing makes me so mad" says. It's a big deal.