I think that it's not just American-English versus British-English, it's the whole package of talking.
Everyone has different speaking patterns, so even if you stayed in a British-English fandom but went from Top Gear to Merlin, you'd still have to adjust to a different way of talking, because it's not like Merlin or Arthur are going to talk in ridiculous metaphors like Jeremy (or James, for that matter, with his car-cheese comparisons).
So maybe American-English versus British-English makes getting used to writing different speaking patterns a bit more difficult, but if you used all the right American terminogy but had someone like Jack O'Neill talk like Jeremy Clarkson in every other way, it'd still be completely wrong.
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I think that it's not just American-English versus British-English, it's the whole package of talking.
Everyone has different speaking patterns, so even if you stayed in a British-English fandom but went from Top Gear to Merlin, you'd still have to adjust to a different way of talking, because it's not like Merlin or Arthur are going to talk in ridiculous metaphors like Jeremy (or James, for that matter, with his car-cheese comparisons).
So maybe American-English versus British-English makes getting used to writing different speaking patterns a bit more difficult, but if you used all the right American terminogy but had someone like Jack O'Neill talk like Jeremy Clarkson in every other way, it'd still be completely wrong.