Analysis of 103,670 high-risk cardiac patients requiring coronary revascularization found heterogeneous treatment effects between coronary artery bypass grafting (CABG) and percutaneous coronary intervention (PCI). Using target trial emulation methodology, researchers identified seven distinct patient phenotypes through latent class analysis, with only patients over 75 years without chronic kidney disease showing consistent CABG benefits across all cardiovascular outcomes. The remaining six patient classes demonstrated mixed benefits and harms between the two procedures. This finding challenges the assumption that CABG universally outperforms PCI in high-risk populations, a belief largely based on decades-old randomized trials that may not reflect modern patient complexity or treatment advances. The heterogeneity suggests precision medicine approaches may be needed rather than broad treatment recommendations. However, this preprint analysis awaits peer review, and the observational design using administrative data cannot establish causation despite sophisticated statistical methods. The proposed 3,000-patient randomized trial using Bayesian methodology represents a pragmatic approach to resolve remaining clinical uncertainty, though recruitment challenges for high-risk populations may limit feasibility.