-The reason for the burn outs is the system.  TRAIN TRAIN TRAIN RACE TRAIN TRAIN RACE TRAIN!!!!!  It can beat the shit out of you.
-Have you ever raced?  Tuned skis are INCREDIBLY important for doing well.  If you can hold a strong edge on ice because your ski is tuned well enough, you're gonna have a bad time or even fall.  Wax makes you go faster.  Ski racing is about going fast
-They don't usually wait for ideal conditions if they have rock skis.  They just don't want to trash their race skis.
-I don't know where you're getting the conservative out of the gates.  Most ski racers I know kill it on the mountain.  Look at Daron Rahlves, he slays AK lines now.
-Their style is rigid for a reason.  Racing is judged on style.  It's all about speed.  They are incredibly solid skier and are very technically skilled.  They also can't be loose.  Imaging being loose on a race course.  You would fall, miss gates, or just have a shitty run.  When that gets hardwired into your brain it becomes muscle memory, so you do it outside of the course
-I'd mostly blame America for that.  If you go to Europe there really isn't out of bounds and things like that.  Most of those rules originate from people suing.  It drives insurance up, and while you may be in control, if you hit someone, that person might sue the mountain for not enforcing rules that keep people safe.
Also, to address the skiing the mountain here.  It's the same way that there are park rats who never leave the park.