Although many things are relative depending upon the situation... generally speaking, do you all think that the wing chun footwork is "mobile" enough for fighting in it's totality?

I've noticed a lot of different variances from one wing chun system to the next as far as placement of the feet, direction of the feet, weight distribution on the feet, and whether or not to be on the heels or if it's okay to be on the balls of the feet at times during an encounter.

What's your take on it?