No. That is a stupid reason. Sure it doesn't stay sharp as long, but then again semi-chisel doesn't stay sharp as long as carbide. But so what? Different produts exist for different purposes. Full chisel is for clean wood, semi-chisel is for dirty wood, and everybody who cuts any quantity of wood likely has loops of both types in their saw box.
The only thing my dealer doesn't sock is 3/8" .063 semi-chisel (full or skip). Not sure why he doesn't. Other than that, he's got semi-chisel, round chisel, and square chisel in pretty much every modern pitch and gauge you'd want.