TV coverage for the DH was a logistical and materials issue, not really anything else. XC is quite compact and doesnt need excessively long TV camera leads (live feed is not wireless according to the guys I was speaking to who follow and film for the tour around the world). Our track is 1.9kms long in pretty inaccessible areas....no easy chairlift routes to follow!
The leads required to get to the whoops need to be about 1km long, the speed trap is about another 300m, the triple/double/triple, a couple hundred more, and then Alien Tree. Vines is about 300m after the whoops, but still about 800m from the event centre...each camera is on its own lead...what you got was as far as they could extend all the leads they had - this time. They are on the hunt to ensure there are an extra few camera points next time, and an extra container of lead, and probably a helicopter to lay and retrieve them (not kidding).
As for the Rock Garden, the camera angle was as good as you would get without an additional camera. Its really quite an awkward area to film. Clear out the spectators, and the camera would see the stacks...good luck with that - I could barely keep them from stretching the bunting into the racing line!
The Rock Garden actually goes through a 180 degree turn and the exit is probably 10m or so behind the entrance. There are 2 main lines and at least 3 combination lines which makes it quite wide.
Hope that explains a bit.