Agree - anything wider than a 35 mm focal length tends to push the foreground out, essentially distorting what you see . 50-70 mm or “ normal” focal length more accurately depicts what the eye sees. Agree with Phil and others, you need a reference point to accurately convey steepness.Beyond what Phil related, a normal lens view will better capture actual lateral slope pitch versus a wide angle lens. That is also why smartphones may be mediocre choices. Also note, a lens will have more distortion if not held level horizontal that shows as bending elements at frame edges. Even if a camera is held horizontal, cheaper lenses may show edge bending though that can be improved in Photoshop.
Additionally having elements like vertical trees in an image helps perception of slope angle. And of course, capturing an image when lighting allows good snow slope detail and shading is important for any image. Thus a shot in flatter light or direct light or with too much shade are negatives.
When shooting uphill, get low - like on your knees low - to convey steepness, especially with a wider lens . You see this at W.C. events- the photographers on the course are all low , on their knees so they can convey the steepness and swivel to follow the skier.