"We need to fly through a dusty desert atmosphere!"

"Okay, no problem, I'll build a craft with four non-fixed vibratey wings that expel ten times the energy of a rotor or propeller, are much more likely to cut bystanders in half, and have multiple joints exposed to the harsh wear-and-tear of the endless sand."

"That sounds terrible. Why would you do that?"

"Because it will look cool!"

"Okay, let's do it!"