I learned this the hard way when I moved from a company that sold software to the manufacturing / health industries.

Companies that don't sell software, see it as a by-product and have zero worries about its quality, what matters is that at the end of the it delivers the outputs the actual business requires.

So beware of presenting prototypes in such industries, their are always the final product and code refactoring is not something that usually makes them sell more stuff from their actual products.

Also the code tends to be pretty horrible, because a lot is developed by external companies that usually tend to implement a just single set of features. It is almost impossible to write properly safe code, because no external is able to grasp the whole codebase in the required timeframes for delivering the new feature and leave to another customer.