Is the practice of segmenting speed zone data by power output, heart rate, and cadence truly the best way to identify areas for improvement, or are we overlooking the importance of other metrics such as aerodynamic efficiency and terrain-specific adaptations? Some argue that a more holistic approach, taking into account the complex interplay of physiological, mechanical, and environmental factors, would yield more accurate and actionable insights. Others claim that the traditional methods are tried and true, and that the added complexity of incorporating additional metrics would only serve to muddy the waters. What are your thoughts - can we really trust our speed zone data to give us the whole picture, or are we just spinning our wheels?