I think you misunderstand me :). I don't think .cym is a bad idea at all, but I can understand those who might think it is not. Wales is not a country in the way that Russia, Tuvalu, Kenya or even Jersey are (and even in the latter sense there are fringe cases such as Western Sahara, Kosovo and South Ossetia). If Catalonia and Wales are OK, is Sápmi? What about culturally distinct minorities with no political recognition such as the Roma? It's just too messy.