Because you need to walk before you can run, oh, sorry, I mean do figures.
Not at all. All figures incorporate some form of walking action, anyway, and if being able to walk well was a prerequisite to dancing figures, no one would come back, in week two, to the figure-based class. They do, and what's more, they are eager to know what 'move' is being taught that week, and if it's too dull, they won't come. One of the teachers near me actually uses a mailing list to send out emails every week setting out the name of the 'move of the week'. As it happens, they are nearly always to be found in the DanceVision syllabus, but I think we're not supposed to have noticed that.
The same teacher has everyone follow him on a stroll around the room for five minutes or so at the start of every class, and while I have observed his teaching, on and off for two years, he has yet to say anything at all about the purpose of the exercise, or said anything at all about the mechanics of the walking action, or anything at all about the relationship of walking to the music or to the 'moves'. The students also only ever walk forwards. I don't dance with his students much.