Reasons why flying edge is better than dropkicks:
-Dropkicks can easily be ducked on reaction
-You can't follow up on a guard break after a dropkick, can you?
-A dropkick can't hover over viola's CE.
-"Flying edge" has two words. "Dropkick" has only one.
only Thermidor could so something like that.
IRL dropkicks hurt like hell if you don't land right, and even then you're screwed if you don't calculate it right.
(all this coming from someone who used to practice them for fun)