As one instructor I know interprets it, "uchi" to him is a strike/hit where as "kiri" to him would be a cut. So, the forward extending shomenuchi (rather than a downward "cutting" shomenuchi) is that it's aimed to mimic more a sword strike of, say, knocking off someone's helmut/kabuto. Hence, "shomenuchi" for him is closer to a ganmen uchi (a strike to the forehead) with the tegatana (hand-blade) whereas the downward cutting "shomenuchi" to him would be called "shomen kiri" or "kiri sage."
However, I will add that many people's interepretations of shomenuchi are, indeed, more like "running with one's hand stuck out in front of their nose"...
-- Jun
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