Part of the problem in understanding what everyone means is that the word "design" is quite ambiguous these days. I'm a programmer working in web "development"

Part of the problem in understanding what everyone means is that the word "design" is quite ambiguous these days. I'm a programmer working in web "development", and some of the things you lay claim to (UX, UI) are things that I'm responsible for rather than our "designer". So I guess there's really a spectrum of different types of activity (rather than a binary partition) and the choice of who gets what responsibility is a local one. Some organisations have people who have exotic job titles with words such as "User Experience" and "Information Architecture" in them. I suspect that "designers" and "developers" in those organisations have much more clearly separated roles.