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*In theory* even tight bore barrels should have a small 'cushion' of high-pressure air surrounding the bb the whole way down, so contact should only happen if the barrel is dirty, or isn't straight enough.
So I think the picture they draw of a bb bouncing around in the barrel is not representative of any good quality, clean barrel.
Having the wider bore probably means that it's more forgiving of any irregularities in the barrel, but really, if you have the choice of a straighter / better made barrel, shouldn't you do that instead?
Of course it depends just how straight and even you can expect the best manufactured barrel to be. The best accuracy would come from a bore just wide enough to compensate for any deviations that can't be helped.
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