The author isn’t comparing apples with apples. “Butterfly valve” is the name for a type of widget. There are many instances of “butterfly valve”, some of whic

The author isn’t comparing apples with apples. “Butterfly valve” is the name for a type of widget. There are many instances of “butterfly valve”, some of which will have strange brand names. Just like there are many “web frameworks”, each with weird and wonderful names (“Django”, “Rails”, “Spring” etc.) We’re really not that different.