Good article. It depends on the definition of “beautiful”.
If you care about the looks and want to make it clean, calm, uncomplicated etc - then you end up with user interfaces that are sparse and visually pleasing in an easy way. This works for simple things, but it may make complex work more tedious.
If you design for handling complex tasks (an airliner cockpit, a Bloomberg terminal, a digital audio workstation), your beauty standards move much more to usability. It still needs to be visually pleasing, but here with a focus on discoverability and calmness in complexity.
