Correct me if I'm wrong, but isn't a finishing move a technique performed on a dazed opponent, one who has been softened up and is no longer a threat? Isn't it a bit of an indulgence, a dramatic-looking move that would not work (usually because of telegraphing) if the opponent were still a threat?
If so, I can see why it would violate a few WC principles.
In Wing Chun the techniques are closely chained together to overwhelm the opponent.
The finishing move just happens to be the last movement of the technique chain.
It doesn't matter if they are dazed or not , they just have to be trapped and at the right range for the technique.
These techniques start and end in nanoseconds , and which one you will use depends on what position the person is in and how they are standing.
Usually it starts with chain punching.
Then it could end with any of these type of technques
Chain punching followed , by hook kick to inner or outer thigh.
Chain punching , followed by elbow strike to sternum
Chain punching , followed by latching the neck and knee strike to sternum
Chain punching followed , by elbow strike and sweep
Chain punching followed by stamp kick to back of opponents knee ( if the opponent is side on )
Chain kicking , a rapid combination of three low kicks to the opponents legs combined with wrist latching and striking.
There are quite a few more , and they transition seamlessly from punching to trapping to finish in a matter of seconds.
Apart from the elbow strike and sweep where the opponent hits the deck very hard , they are not dramatic in their execution , in fact with a properly trained practitioner you would probably not even be able to tell exactly what he did , such is the economy of movement.
But the effect of the power on the opponent is pretty dramatic , a bil tze elbow strike into the sternum can really drop someone.
As I said before , they are usually the extremely close range techniques like elbows and knee strikes more than anything else , using an axe kick as the last strike in the technique chain would make as much sense as bending down to punch somebody in the foot from a Wing Chun perspective.
It just wouldn't be the done thing.
You can see the elbow strike and sweep used as a finishing technique at 0:24 in this clip.
[video=youtube_share;t_y69TgpDOE]http://youtu.be/t_y69TgpDOE[/video]