We all agreed on the IV fluids point, I think there was just a misunderstanding somewhere in there.
Ambulance protocols on hemorrhage control are going to probably be different than remote location protocols. Ambulance protocols aren't going to rely on tourniquets as much because its easier to employ the other methods of bleeding control, and transport times tend to be a lot shorter. In the ambulance system where I work now our protocol is similar to what you described, with the tourniquet as the last option.
There is a lot of room for individual judgment though also in our protocol. Sometimes you see a wound and just by looking at it you know a tourniquet is needed. On the scene of a 5 person MVA you may use a tourniquet to control bleeding you would ordinarily use a pressure point on, but since you have more patients than you do resources you need to employ a "hands off" treatment method.
I wouldn't go as far as to call them a "gold standard" but they are a very definative method of controling bleeding. The biggest thing with them is knowing when it's appropriate to use them, and how to properly do it.
One of the other things that needs to be looked at also is how much time are you willing to spend trying alternative bleeding control methods before switching? Or, in other words, how much blood are you comfortable with that patient loosing? Closer to the hospital that amount may be a bit higher. The further away you are, the lower that number gets (at least for me).
So to answer your question in a more succinct manner; Tourniquets have their uses, and should always been considered as an option when appropriate. The further away from definitive care you are, the better an option they are when talking about a severe wound. Things such as transport time, transport method, number of skilled personnel available, amount of resources such as IV fluid and O2, blood loss already sustained, and MOI are all going to affect how likely I am to apply a tourniquet to control bleeding. The longer times you have, and the less resources you have, and the sicker the patient is all increase the likelihood that a tourniquet is going to be needed.
Does that make sense? (Sorry about the long-winded post. Maybe AKflightmedic can come by and summarize better for me).