You may think they are simple machines which do one job and pretty much never need to be changed (not an unreasonable assumption), but that's not the case. I work in the medical device field and, well, you still have to sell instruments. To do that you need to beat the competition. To do that you need more features which make the doctor's/tech's life easier and the diagnosis more accurate.
That doesn't mean upgrading is easy. At the 501k/PMA level it pretty much always requires a re-filing, so you try not to do it often. But you do improve the product over time.
That doesn't mean upgrading is easy. At the 501k/PMA level it pretty much always requires a re-filing, so you try not to do it often. But you do improve the product over time.