How can steel studs possibly compare to traditional lumber in holding strength? The fasteners will at best engage with a minuscule amount of metal of X wall thickness and then break through into empty air which offers no engagement with the threads.
This compared to a screw being embedded in, engaged with, and supported by a constant mass of wood along the majority of its threads as seen in classical 2 by X construction.
Where I'm especially concerned is that noise isolation is very important with this project, which leads to variations of stud and leaf arrangements that become weighty, quickly. Usually, this would mean several sheets of 5/8 Gypsum or the like, concrete board being even heavier!
I'm just not seeing how the entire thing won't become a bit wobbly, with the screw tip, in particular, free to dance around inside the cavity of the stud as it likes when under load.