I don't know why I don't clarity on this issue...but I don't. So I'm looking for input;
At our resort, we want our trails flat. I'm sure most people agree w/that. Many of our runs are narrowish and have high traffic, so daily they get dished out pretty badly. Every night, we need to pull in the sides, pad the middle and make it flat again. If we have enough time, we might even make it "crowned" a tad to anticipate the skier impact the next day.
The side effect of that is snow "Curbing" on the edge of the trail, along the tree line. Curbing is no good b/c it looks shitty, and it's a bit of a liability if someone goes off the trail (though the curb is often soft, not always). The only way I know how to mitigate this issue is to NOT pull in the sides as aggresively and leave the run somewhat dished. But that looks crappy too, and makes it hard to not leave track marks.
On a very WIDE open run, you can blade it all flat, and leave a radius at the edges for mitigate a curb. The run still looks and skis...flat. But on a narrow run, if you radius both edges, you end up w/a distinctive "dish".