The Irish were much further removed linguistically and culturally from the Celts that resided in the Wales, Cornwall and Brittany. Despite being separated by seas, these three communities sprang from a common cultural, linguistic, and ethnic pool, and had trade, cultural exchanges, and inter-marriages with each other far more than they did with their more barbaric neighbors (saxons, normans, and franks)
In this era, the sense of being "Welsh" or "Cornish" or "Breton" was just being defined. In the Saxon era, they would all have considered themselves "Britons" and their language, Brythonic, was virtually identical in Cornwall and Brittany through the 1100s. The idea of a single de jure British kingdom is fantasy, of course, but so is the idea of any kind of united Welsh kingdom in this period (or Irish or Finnish or African...). If you think of it as a successor to Arthur's Briton, maybe it makes some sense.
In any event, I think it's an interesting solution to some game play issues that has some historical justification. Brittany should never have been part of de jure France. And it was too easy to form the Kingdom of Wales as a Welsh Count. Unfortunately, the fact that Brittany taking just one more province will now be able to form "Wales" may lead to new gameplay issues. But I'm willing to give it a chance.
(...)
