For poo sake why does previous dance experience always get mentioned!??

, Most of the celebrities will of done some kind of dance in their life and career . Emma B is an actress and has probably done lessons.
Karim has done ballet so what , and Kelvin again from an acting background has probably done theatre. Why do some people get let off and others get given hell gief for so called "dance experience" like they've committed a crime??? .
If you want strictly to have ZERO experience and total unfit dance VIRGINS
with 2 left feet , then the competition would just be full of Ann widdecombe's & Ed Balls'

.
Sports people and physically fit people also have an advantage , every year this same argument is always raised whilst certain celebs get the nice treatment and others bear the brunt and it's NOT FAIR .
Strictly producers ask a variety of celebs to take part , i don't know what people want exactly ????. It would be boring if everyone was crap or the court jester.