It's not surprising that most backpackers don't carry a fixed blade knife. There's really no need, and it's extra weight. I think those involved in "bushcraft" are more likely to carry a fixed blade, though. It sounds like that might be the perspective you're coming from.

Personally, I carry a Swiss Army Classic in my pocket all the time, so it goes along, and when hiking I also take a small folder, like a Gerber LST.

I like knives, and have a couple of fixed blades, but wouldn't be likely to take them backpacking.