If you do it yourself you will need to speak more slowly - I found some words were not clear, eg the end of 'currency' kind of disappeared. The problem with an accent in an instructional video is that it's a distraction, and if the topic is challenging the viewer really needs all their concentration for that. That doesn't just apply to 'non-native' accents - as an English person, I would find an American drawl or a strong Scottish accent an irritating distraction if it meant that I had to listen extra carefully.
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