Unsmooth Smoothie

I want to make smoothies, and you do so with a blender. But here's the issue, and you'd think someone would have figured it out. The blades are meant to chop the ice up, but this creates an air pocket, and then it's useless. You would think that there would be some mechanism, like the fins of a washer, that would stick up and draw the stuff downward. Nope. You would think this would solve the problem. And yet, you don't see it. Why not? I don't know. The blade design for blenders seem unchanged.

Yet, it would solve so many problems, and yet, surprisingly, the design remains virtually unchanged.

Put a little brainpower into it guys. Maybe you'll inadvertently solve the problem.