Good air pillows weigh in the region of 50 grams and take next to no space at all. I see no point in not having one since the added comfort is immense.
Someone pointed out that it's the older tourers like their comforts but I'm 26 and I also like my comforts. I've seen enough crud for one lifetime so I'm going to to tour in relative comfort being able to eat a hot lunch whenever I feel like it and not just munch down clif bars the whole way (ew...) Getting a warm meal every now and then (three times a day is optimal) is a huge morale booster when the going gets cold, as is alcohol. I'd smoke too if it wasn't so dang unhealthy (thank the lawds for electric cigarettes and snus!)
I guess for some ultralight touring is about how little they can survive with. When you take that stuff over the limit you don't really want to try it again. At least I don't.