What specific performance metrics provide the most value when evaluating the top supplier relationship management tools during a software trial, and who should hold the final authority over vendor segmentation when balancing cost savings against strategic partnership goals? Why do so many organizations struggle to move away from fragmented spreadsheets to a centralized SRM system despite the obvious benefits of automated risk tracking, and how can a procurement team effectively prove the long-term ROI of these platforms to skeptical stakeholders who are only focused on immediate contract costs?