why? because skateboarding is the coolest and so we should copy them? done by most people, what you call a bluntslide looks absolutely nothing like a bluntslide, which could almost always be called ollie over tailslide if we have to use skateboard terminology.
Not a Bluntslide
If we have to have a bluntslide, it should be to do with the angle which is what actually makes it look vaguely like a bluntslide.
By your definition, the two ski tricks I posted are the same.
problem with using skate trick names is we don't have trucks and we don't even face in the same direction! can we just stop trying to be skateboarders/snowboarders? I like that they influence the way people ski and the tricks people do, but fact is we're skiing.