Without weapons only body has to be 'understood', 'felt' and 'controlled'.
With weapons, there's something in your hand (most likely) that has to be extension of your body.
So many more moves and potential errors. They have to be reduced to zero with training. Even if this goal is not reachable, it's there to strive for.
Should 'enemy' be considered here?
Only during shadow fighting.
Overall we wish to control our bodies and fight with ourselves, 'enemy' will falter (surrender or lose) automatically with time, best if without a fight... just by looking at us, via the Internet or not.