Nonsense, I play DDR in skate shoes all the time and I'm no worse for the wear, and I actually prefer them to running shoes or regular sneakers since my feet dont get as sore. The only time I could see where having shoes with an arch on the underside coming in handy is if you're trying to hit hands over the brackets on the pad with just your two feet. Really, though, the point of the recessed arrows (or raised) in my mind is for ease of use, you can tell exactly where you are based on the feel of the pad below your feet. If you've never played on an arcade machine before, this will be new to you, but IMO, I believe it will help you improve more than playing on a flat mat.
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