We do it. Our department is a small rural all-volunteer. We white hats weigh the experience, ability, etc. of an established IC against on-scene manpower. It's not a case of, "Oh, goody! I'm gonna go fight fire!" There's a lot of consultation and soul searching before one of us commits to going inside.
On a side note, we get to see our people in action. Training issues can be seen periodically, etc. Too, all our people know that we're no better than they are, so to speak.