Judgement is the end of thinking.

Isn't it funny how it'seasy to start mulling over unimportant stuff, but when it comes to exercise critical thinking about our experiences in life, we tend to jump to conclusions? Why is that? Maybe it's an ego thing. Another thing we do usually do backward.
Any way, as soon as you pass judgement, it signifies the end of the thinking process. You made up your mind, and no further questioning occurs about whatever you judged.
So, if it's the first thing you do, isn't a bit too bad that you didn't give a second thought? When you don't even question yourself for a second about another person or an experience you just had— or are having—what is it costing you? If you start with the end, you never give yourself the chance to fully live life's experiences, and never give them the chance to bloom and create something meaningful.

More often than not, waiting on before passing judgement give time to take in more information and see a broader and better picture. How accurately can you judge the size of an iceberg just by its tip?
To make the most of your experiences, I believe one of the most effective thing you can do is develop the habit of deferring judgement as long as possible or practical. That way, you leave the door open to more ideas, more possibilities. This will enable you to get more information, more time to think about what's going on, leading you to have a better understanding of reality.