I don't know when Tormek started to recommend radiusing the corners of the grinding wheel (not for diamond wheels). Wolfgang demonstrates this in the first (knife sharpening) online class. Before the online classes, Tormek did not seem to have an efficient way of sharing this kind of information.
I do not recall reading about it in the handbook. I do recall Jeff Farris referring to something similar in a brief ancient forum post. Jeff mentioned that he was grinding a radius in the outside corner of his grinding wheel. Unfortunately, he did not provide any reasons for doing this.
If any of the forum old timers remember anything more about this, please post and share it.
Thanks.
Ken