So, Patrol and officianados, does having a ski strapped to your boot and flopping around present a greater danger as you slide down a steep face in a very large sluff?. Does it pull you under?
Instead the advice is to try and fight. Dig your poles, heels/skis into the bed surface and try to let as much material pass you by. Try to stay toward the rear of the debris flow if possible. Keep your pack on for spinal protection and to help you be a larger particle in the flow. Some studies indicate that larger particles tend to be floated upwards despite their greater weight. Try to keep your airway free of snow. Try to create an air pocket in front of your face/airway if you are going to be buried.
So to answer your question. In the slides I have been caught in, (3 that are worth mentioning and perhaps another 8-10 that are not. I wouldn't feel real great about being strapped to my skis by a leash.
There are some options such as Fastex buckles that will break/release under a high force load.
All that being said, I do my A/C work on Non-releasable Tele bindings but do not wear runaway straps. I clip them back to the skis until A/C is complete.