Split Point Drill sharpening

[tonyfoale]

I'm not totally in accordance with Tony's explanation, ....

I didn't give any explanation, I asked a question which has not been answered yet.
WHY should I break the habit of a lifetime and stop tool sharpening on the side of flat wheels?
As advised I looked on Norton's site but the only relevant text that I could find was a list of DOs and DON'Ts. The DON'Ts said avoid the side but without explanation.
I have never been very good accepting DOs and DON'Ts as plain statements, but I will always consider an explanation. When someone tells me not to do something I expect that they will know WHY and be able to explain it to me. So far in this case the WHY is lacking.