No constitution is or can be perfectly symmetrical, what it can and must be is generally accepted as both fair and usable.
I have perfectly symmetrical ankles.
If you can make yourself symmetrical, you're sending out a sign that you've got good genes, you've got a good upbringing and therefore you'll make a good mate.
Your whole being should be symmetrical. Yoga is symmetry. That is why yoga is a basic art.
I could never focus on my upper body as a skater, so I'm enjoying having symmetrical upper and lower body muscle.