I have my differences of opinion with most UI/UX teams I worked with (in particular, I don't buy the trend of making software as easy as possible at all costs; it leads to dumbing down and reduced utility). But I'm not blaming UX people for this. They have as much to say in this topic as developers about third-party JS bloat - i.e. we can all complain all we want, out of practicality or morality, and ultimately the decisionmakers don't care.