Poor form is not only in the eyes of people, it is a real thing,  if you look at alot of todays park skiers, they are full of bad habits, they drop their hands, they let thier body rotate with the turn, they slide on a turn, half can not ski on edge, again these are all things you learn not to do in racing, (ask any person who has raced they will tell you that it has immproved their skiing immensly). Well back to the bad form, when you are in the park alot of these bad habits do not severly hinder your abbility to preform, yet go into the big mountain or powder sceane and you WILL GET ABSULUTLY DYSTROYED. these things just kill you, I dont care if you ski that little hill in the midwest for 95% of the time, chances are that you are a 14-18 yearold and your family will go on a skiing vacation once a year to whistler/colorado/utah/BC interior/california. Here you will not want to only ski in the park you will go into the real mountains,  You will get your ass kicked if you do not no how to ski. do a few groomers once a week at your home mountain and work on your form (ight upper body, arms up ext.) one of the worst examples of not knowing how to really ski is tanner hall, (he has gotten alot better now that he does more of it) but when he first started to go out of the park he dropped his arms and this led to his body going into the turn which would keep him from flowing turn to turn.  So basicaly what I am saying is living in the midwest is no excuse to not know how to ski.