Decision making is an important skill. Sometimes you have to make a decision to move on from something even though you don’t know what decision to make. Sure before you make that decision you may feel like there are more possibilities open to you but without making a decision you do not progress onto something new.
Also a similar thing applies for opinions/views. Although it is great to be open minded, sometimes to get anywhere in trying you have to form some sort of viewpoint. You need some kind of basic theoretical understanding to act as a foundation so you can use the understanding in useful ways although a belief (a strong view) may limit you from correcting the theory. A very broad example would be your world view, which is your overall perspective on the world and life. This may help you decide how you act and act a bit like your guiding principles.