As for Black Marsh, I'm afraid Beth can't make it into an authentic lore-true experience anyway. Why? Well simply, cause Argonia is pretty much the most inhospitable place of Tamriel. Forget Ashstorm, Argonia has swamps that suck you up, flies that eat your face given half a chance and who knows what else. (Although, the worm subway sounds like a cool alternative to Siltstriders)
If they went with Argonia, either the place would be so dangerous it takes all the fun out of it, or it would be a relatively safe forest rather than a swamp. In the first case casual players would give up out of frustration and roleplayers would find it too tedious to roleplay. In the second case, those who play for the lore would fall on it harder than they did on Oblivion.
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Fabulous hairneedle attack! I'm gonna be bald before I hit twenty.
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