You can make decisions in business and life in one of two ways. You are either all in and have no fallback plan. Or you have a Plan B in case your initial decision goes wrong. There are variances in between but let's forget those for now. I'll refer to these options as "all-in" or "multi-plan" for our purposes here.
All-in is pretty easy to define. You make a decision and you commit to it. There is no going back and there is no second guessing what you've decided. You have "burned the ships" after arriving at new shores as the saying goes. This is by far the riskier option yet it usually takes far less time to make this decision. At the same time, you have to "succeed"no matter what.
On the other hand, you have multi-plan decisions. Here you may make a decision up front but you also want to make sure that you can course correct while on your way. You don't commit to a very specific outcome. You have a Plan B as mentioned above and you have multiple scenarios sketched out how things can go. You usually have to involve multiple people in your decision to understand all the options or you have to model many different scenarios to pick the one to decide on.
Here's the problem. If you have a Plan B, you better get a Plan C and maybe even more ready. Why, you may ask? Well you already decided that you are not making the best decision. You are making a decision based upon the likelihood of failure. Many will say this is prudent and leads to good decision making but if nothing else, it makes you horribly slow to decide anything. Further, if you don't fully commit to one option, why would you commit to a second....or a third.....or a fourth? Commitment is necessary for success.
What this is leading to is the fact that there are two types of decision makers out there. Those who want to succeed and commit to their decisions and those who are trying to cover their asses. You don't even have to commit to your own decisions but to those of others. Jeff Bezos famously pushes a "disagree but commit" strategy at Amazon. Anything else is half-assed and will lead to failure. I am sure many would argue that you need fallback plans and it is prudent to model different scenarios and be able to react. You will note though that I never said you shouldn't be ready to react.
The reality is that you often commit to a decision and things do go wrong. You have to be willing to be the type of person who argues that they'll cross that bridge when they get to it. That is how things work. You don't necessarily have to be in a leadership role but you do have to commit to your decisions in life, at work, in relationships and so forth. More importantly, stop constantly worrying about everything that could go wrong. Things always do. Spend your time focusing on that when you need to instead of wasting your time with Plan B, C, D, E, etc.