You can reason about classes of theories instead of theories, and then rank them...

		davrosthedalek on Feb 27, 2017 \| parent \| context \| favorite \| on: A Physicist Who Denies That Dark Matter Exists You can reason about classes of theories instead of theories, and then rank them. "Ugliness", as you write, might be one of the ranking criteria, but there are others, for example "predictiveness".