My delts and traps are way better than my calves too, but also much more fun and easier to train cos you can throw around big weights. This just means that delt = more fun, though, not super elite genetics or anything. Most regular gym rats are all chest and arms for the same reason, usually with some delts. Bothering to train calves is the test of someone who really wants to develop their body. If people trained them with the same enthusiasm as chest and shoulders they would no doubt actually have calve development, even with shitty genes.