Position: AI Competitions Provide the Gold Standard for Empirical Rigor in GenAI Evaluation. - D. Sculley; Will Cukierski; Phil Culliton; Sohier Dane; Maggie Demkin; Ryan Holbrook; Addison Howard; Paul Mooney; Walter Reade; Megan Risdal; Nate Keating (CoRR, 2025)