The other problem is that sometimes from the perspective of an experienced user, "good UX" means "works exactly like the piece of software I've been using on a

The other problem is that sometimes from the perspective of an experienced user, "good UX" means "works exactly like the piece of software I've been using on a daily basis for the last 15 years." Even if a brand new UI is objectively better, to someone who's invested thousands of hours in becoming fluent, fast and efficient with an existing UI (however quirky or obtuse it might be) the new UI will be an impediment to productivity.