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I believe the movement was started by MC Tester back in 09?
I think one of the carbon fork manufacturers actually started it, after noticing some failures caused by stem clamping according to the original Dia Compe AHead instructions which were written for steel steerers. By spring 2009, I had a tidy implementation in place.
gbj_tester
This (spacers on top) has become de rigueur. I believe the movement was started by MC Tester back in 09? The stem is zero degrees hence perpendicular to head tube. Anything over this is considered upward and therefore rightfully anti.