I was asked if it was OK to sidekick when fighting multiple opponents. I always reply "you shouldn't kick" when asked about kicks. Here are a couple of reasons:
1) Feet are for moving and kicking makes it difficult to move.
2) Both legs are needed for punching power. Try punching on one leg...Punches are the superior weapon, keep them ready at all times.
3) Kicking commits the user, and might not do much damage against a heavier opponent, (think 65kg kicking an 85kg opponent), unless you hit where it really hurts. That's why we in FWC aim all kicks against the knee joints or the groin.
4)The right kicking distance is difficult to achieve when the opponent is moving straight vs round in a circle (real life vs competition)
That said, we do have and apply kicks in functional wing chun but in a different way that most kicking arts do.
