Surely to carry on the tradition, they need to add more of themselves, make it a bit more 21st century, move things forward whilst maintaining the spirit of the earlier age?
The conscious rejection of modern elements is just as much a "21st Century" idea as any other decision they could make regarding the content of their music.
I agree, rejecting modern elements is practically cutting edge in an age where it's all about progress and growth. And these guys still take the song exactly where they want to go with it. I think there's a lot of themselves in it - it's all them.