As an American, to us the Irish-Scottish difference is a lot more obvious than Welsh-English. Scottish can be very difficult to understand for us at times, it's very harsh and gutteral, where as Irish is a soft, pleasant, almost song-like accent that's difficult to mistake.
I think Irish is more similar to English than Scottish.
I think they did it the way they did based on cultural considerations. The Scots are Irish, if you go back far enough. The Welsh aren't either, but they've lived alongside the English long enough.
On topic, my favorite campaign so far (and I've only had the game for a week now) is Crusades, mostly because I've hyped myself up for it. I find Americas far more fun than I assumed I would (being part Chippewa myself, it's pretty fun to play as the Apache, the closest to that culture we've seen in a Total War game thus far).
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