This. Bulldozer was (ironically) AMD's Netburst moment. They made a speculative play ("modules" in the case of Bulldozer, long pipelines in the case of Netburst

This. Bulldozer was (ironically) AMD's Netburst moment. They made a speculative play ("modules" in the case of Bulldozer, long pipelines in the case of Netburst) to chase high core counts/clock speeds (respectively) and the technology didn't end up panning out like they expected on top of performing worse out-of-the-gate than the architectures they were meant to succeed. The difference is that Intel had the cash and political clout to wait out Netburst and force the market to take it while Bulldozer nearly killed AMD (which only held on thanks to its GPU division, itself now in crisis due to lack of competitive products due to under-investment).