Sometimes I wonder about the scouting community (at least in my area) when it comes to lightweight backpacking. I gave a backpacking demo at a BSLOT (Boy Scout Leader Outdoor Tranning) tranning class last fall, and had various types of shelters setup. I had a 8x10 silnylon tarp pitched in bomber mode, a DIY tarp tent, a Single wall Eureka, and a Double wall Kelty and a DIY hammock(too show what each was, and what was available). Most of the guys laughed at the tarp and said that they didn't like the no floor aspcet of the shelter or no bug protection. Some also said that a tent is much warmer. Although when I asked what was lighter, a few extra ounces of Insulation and a few pounds of uneed nylon, I got some; Oh yea I guess that makes sense.
On the flip side, last October, While on three day trip with my Troop, we shared a campsite with another troop, and some of the leaders were carrying ULA Catylists and another a SMD Comet. So I guess it all comes with experience.