there might be some logic in that, more media means more root growth through a larger profile, longer roots would take more time to return energy, less energy for blooms, there is only so much energy, based on the amount of photons your plant can carry and convert. You can adjust this by tweaking the photosynthesis system, ie adding CO2 Temp RH and so more food.
All plants, even those grown in salt baths of shit minerals will leak up to 30% of all energy they make during lights on, this passing in to the media via the root system as exudates, dinner bells for microbes in a normal world where we dont destroy life with salt.
Binding the roots would likely reduce the overall leakage, so you may get a percentage drop in exudates that means this reclaimed energy can go towards blooms? just a thought. coco's superior O2 holding capacity is likely the reason this works in coco, but not in soil.