Ise wrote:
This matters as off-piste avalanches tend to occur around the 28 degree mark so knowing a slope angle is a big deal, that's a reflection of a two part fluid dynamics problem if we looked at a spontaneous failure of a slope but it's also worth considering the mechanics of a skier on the slope, a skier creates about twice as much traction on a 45' slope as opposed to a 20' slope. This is why skiers need to understand a little of slope angles and maths if they're venturing off piste and be able to read and understand information in guidebooks and on maps. It's also why I personally carry an inclinometer.
Steep off-piste is easier than steep on-piste in my book but that might be relative
Interesting tech info here Ise, I have seen some wind slab avalances on slopes that looked quite innocuous. There must a huge number of off-pistes with a slope greater than 28deg.
I think that a piste steepness value can be mis-leading, in that a key factor is how much space there is to work with, ie sustained slope width. I'm sure that you will have done the odd run where you had to make the turns. Conversely, where the piste is wide, there is space to get out of trouble should you miss the turn.
I do believe there is scope for improving piste info to give more than "red", or "black" America does give a bit more, in qualifying black runs.