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When they first came out the theory was that because there is a dish to the bevel they grind plane irons for normal planes would be prone to chipping. It's not really a problem though. A low angle plane cuts bevel up so it's not an issue but you shouldn't use the Charlesworth ruler trick on the back of the plane iron something people often forget.
Weird, I never do mine on the Tormek but I must have made that decision a long time ago and forgotten why.