This is all very true. However, why get frustrated with people who think they are responsible for user experience? Everyone’s work affects UX, as you said, but not everybody is equipped to measure how their work affects user experience. When an individual thinks they are responsible for UX, it simply means they work with people to help create better experiences for other people. Surprisingly enough, there are many businesses and products that don’t easily see how the experience of others impact their survival….Until that day comes when everyone learns how their work affects user experience, we still need people that take that responsibility.