Not sure where these misconceptions come from, but UX is a total team effort, that large bullet list of ‘how UX wants to be seen’, is ridiculous. UX is a team effort, having one ‘UX’ expert or ‘IA’ expert handle all that is small shop thinking. In large enterprises you need a product manager and a dev manager working with their subordinates to delegate and achieve all that. Not sure why UI design gets broken down into these ‘roles’ or ‘careers’, a great web designer should have an outstanding eye for user flow and layout and should be lead by a functional team that is reviewing their app’s analytics and providing the guidance for new features and enhancements based on those metrics. UX is definitely important to a product’s success or failure, but I’m tired of hearing that you need one expert to set it all in stone for a project. UX usually becomes ‘paralysis by analysis’ for products when you heed to ‘the’ expert. The most important part of UX is setting a proper user flow for conversion goals, you don’t need a scientist to figure that out. Personas are important too but that is a web designer’s job. UX falls under web design period.