On the contrary, my experience on the enterprise is the exact opposite: the new projects where the commitment is a high % of workforce are the biggest failures:

On the contrary, my experience on the enterprise is the exact opposite: the new projects where the commitment is a high % of workforce are the biggest failures: the pressure to "deliver value" so overwhelming, that you can't "fail your way to success". You've got one shot to succeed. Do you know any startup who succeeded from the first shot? (and it gets worse - since you have a lot of "resources", you also can't move fast, because there's a lot of synchronization overhead: you can only employ a significant workforce once you know _very well_ what needs to be done; on new projects, that's never the case.)