There's nothing per se wrong with it. Although it depends on what you mean by "substantial". I doubt you need more than 60 to 100 grams of carbohydrates around your workout, i.e. before, during, or after. But glucose (dextrose) by itself is really not optimal for various complicated reasons.

Even looking at "sports drinks" you'll see they contain a mix of carbohydrate sources. This is done for a reason. Without going into it all you'd be better off using a half and half mixture of dextrose and maltodextrin (half and half in terms of grams of carbohydrates) which will make for easier and faster absorption.

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If you act sanctimonious I will just list out your logical fallacies until you get pissed off and spew blasphemous remarks.