Ken, my question actually came from my recent trip to Lone Pine Peak, California. On the first day we hiked about 4.6 miles and camped at Grass lake. On next day, we started to hike up to the peak, which was a class 2 climbing. The slope was about 45 degrees with rock debris falling down. The poles were greatly helpful under that condition.
Even it was a easy hike, I still think trekking poles will make one go faster and further, which is consistent with the concept of UL. But I think this is off the topic.