That's a good point that applies to gear in general, Bill. You can get some incredibly light things, but if you have to change your style in order to "baby" the gear because it's so delicately built, it's probably gear that's not all that reliable to begin with. I'm not talking about whether it can stand up to being thrown around or bounced off rocks, merely whether it needs to be in specially padded cases, or other "special" handling. All gear should be handled gently, but that's "normal" gentleness, not stressing out over what the next breeze will do to it.

Having said that, I'd submit that WM bags don't require any special handling compared to other good down bags. They're built plenty sturdy enough. However, any nylon-shelled bag - good or cheap, down or synthetic - is vulnerable to campfire sparks, and should be equally protected (like the door on your tent does.) The price tag of the WM bags simply creates an erroneous perception that the damage is more severe, or that they need to receive extra care in use.