Collings uses spring steel inserts in their acoustic guitar necks only. They are not there for reinforcement. Rather, they are utilized as "tone bars" that add just the right amount of mass to the neck for a better transference of vibration/energy from the body into the neck. If you were to play 2 identical guitars, one with tone bars and one without, you would feel and hear the difference. The one with tone bars will have noticeably more sustain as well as an increased resonance in the neck that one can feel. Furthermore, in an effort to match the mass of the necks with their bodies, they sort the weight of their necks to best match the model they will be going on.
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