Is it possible though, that Copenhagen is wrong in a similar manner to epicycles that give the correct numerical answer?
That's the impression I get as a non-physicist, that yes it's kind of an aesthetic preference, but on the other hand aesthetics are important and sometimes are pivotal in finding new insights.
Ugly may not be completely objective, but it isn't completely arbitrary either.
I should correct an important misconception. Epicycles do not produce correct predictions.
Epicycles can produce correct point location of planets, but do not produce correct phase. Galileo observed heliocentrism-compatible phase of Venus with his telescope. That was the crucial experiment, not the simplicity.
I don't think it's important to my point. The point remains that multiple theories can be equivalent in some restricted sense, yet the more aesthetic one might have greater potential.
That's the impression I get as a non-physicist, that yes it's kind of an aesthetic preference, but on the other hand aesthetics are important and sometimes are pivotal in finding new insights.
Ugly may not be completely objective, but it isn't completely arbitrary either.