i agree with your statement but only partially....
yes, provided that we can supply an equivalent environment when we move a rock to a tank without much disturbance, there will be less die-off (i doubt there will ever be no die-off)
And no, there is alot more to it than just exposing rock to air. The rock had become balanced to an environment of significant water flow, much more than we can ever hope for in a tank, significant nutrients, which we may think we are adding, but most likely overdoing it on some of them, and under doing it on others, and other life that either the rock feeds on, or feeds on it...and lighting... well.. there is just no way we can provide the right type of lighting, no matter how much money we spend on lighting.
In other words, there is no way we can provide an equivalent environment for a rock that has been plucked from the ocean floor, and therefore, there will be die off, even if you moved to fiji and kept the rock in water the entire time...