Well, the setter combined 2 different themes, and as you say, did it in a symmetrical way, which I think qualifies this as 'elegant'. And as various people have commented, the clues were quite good. The end result was a great improvement on some of the puzzles by neophyte setters in the last couple of years.
So this sets the bar for Listener 2018. Many of the good setters have gone now. It is the challenge for the newer setters to meet their standards...
I see that the depths of aestheticism are being plumbed by some of the other community. Which was the best puzzle of 2017 ? Oh for goodness sake, get a life. Perhaps one not so grandiose ?