Was Guadalcanal the US Navy's main learning ground for wartime logistics?
Short answer
It was an important test that broke weak prewar assumptions and promoted the ideas that worked under combat conditions.
Notes
Guadalcanal forced the US Navy to test prewar logistics ideas against a demanding campaign. Some assumptions failed once ships, aircraft, and ground forces had to be sustained in a contested theater. Practices that worked gained credibility and wider use. The campaign is therefore useful as a learning ground, though the concise answer stops short of calling it the only or ultimate one.