Of course you have to use force to do a trick.
The point I think is more along these lines.
Take the example of a guitar player, I think it really is a good example.
A crappy guitar player will play a certain lick, and it will be kind of choppy, kind of sloppy, kind of lacking in feeling, in style, in tone, in subtlety, in sustain, etc. This is comparable to a sloppy, sketchy skier who you can tell is struggling.
A pretty decent guitar player will play it smooth, wil hit the notes cleanly and will generally sound like they know what they are doing. This is like the hundreds of skier we have today. They are solid, they can play their shit, they can stomp their shit etc, but theres nothing really SPECIAL about them.
Then there's an amazing guitarist. There's that guy who is playing that same lick, but he is playing it with SO much feeeling. Every note is like magic. The whole thing just sounds like it came straight out of his heart and through his fingers and there was no hesitation, no barrier, between him and his expression on his instrument. He brings a certain flavour, a certain in-tuneness, a certain freshness and really a sense of WONDER to his playing. This is what I want skiing to be like. This is what I think skiing can be like.
Then there is that guitarist who is solid, he knows what he is doing and he can actually express himself quite nicely on the guitar, and is just so solid and stuff its like wow that guy is cool to watch and pretty steezy. But he watches these guys that are really like doing their own thing on the guitar, like being ONE with the guitar, like realllly PLAYING the guitar, being the guitar, whatever. And then he's like wow look at that guy bend and vibrato so hard! It sounds so cool! Im gonna do that! But then instead of actually doing it from his heart, he plays his lick in his nice solid way which is real to him, but then he FORCES this unnatural bend and vibrato into his playing, trying to mimick some idea he has of what would make his playing sicker, without really FEELING the playing, without really expressing himself through his instrument from his heart. This is what I see in Wallisch and Brogan's skiing, personally.
I hope that helps.
When I say skiing can be about expression and about art, this is what I mean.