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His point is that they are not noticing anything useful because it does not share the context of the bicycle on which the light is mounted. It may even be a distraction which makes a collision more likely.
Not saying he's right, but it's an interesting point worth investigating. Bet the inventors aren't doing that.
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The difference between a Blaze and regular flashing lights is that with regular lights, the source is obvious. As stated above, when a Blaze symbol creeps up from behind, it's pure supposition as to where behind the rider is, and if there are more than one, it's very confusing, and if it's confusing for a cyclist who understands the context, imagine the reaction of an uninitiated driver (assuming they've noticed it in the first place).
Anything that causes an unexpected change in velocity is dangerous. Just about to pull out and you see something in your periphery is very off putting