There's a big difference between compounding past success and ameliorating past shortcomings. If implementing some improvement goes well, we accomplish our goal

There's a big difference between compounding past success and ameliorating past shortcomings. If implementing some improvement goes well, we accomplish our goals on time and within budget, it's easy to say let's do it again. If a vendor makes me go in front of my boss and say the budget I previously requested was not sufficient and the thing I said would get done wasn't, I will never stake my professional reputation on that vendor again.