What's the length of the average program for 3^^^^3? I suggest it's 3^^^^3, with every language that gives it a shorter encoding counterbalanced by a language with an exactly longer encoding.

For a sufficiently crazy set of languages you could make this true for 3^^^^3, but in general what's simple in one language is still fairly simple elsewhere. If 3+3 takes b bits to describe in language A it takes b+c bits in language B where c is the length of the shortest interpreter for language B in language A (edit: or less :P).