The fact that we can hold only a limited amount of knowledge throughout our lifetime is a sufficient reason to never stop learning. The moment we underestimate the complexity of the world, we close our minds to new frontiers of knowledge.
Look around you. Do you know every single step in the process of creating a computer? You need to understand physics to describe the role of semiconductors and how silicon behaves at the atomic level in the creation of transistors. One can spend decades fully understanding all the moving parts that make a computer possible before making any significant contribution. The same applies to more mundane objects. Everything around us hides centuries of human progress, from the chair you’re sitting on to the Large Hadron Collider.
We can go down a deep rabbit hole on anything you can imagine, just to prove that knowing every single detail of a complex process in all existing knowledge is simply impossible. Contrary to what you might think, and despite feeling discouraged by this (just as I was when I discovered how unfair it is to be given a life without fully understanding it), this is why collaboration among humans has led to the greatest advancements in our history—a collective mind contributing to a specific topic and documenting it to pass down to future generations.
Being aware of this is the first step toward defining how we allocate our attention, ideally aiming for a clearer understanding of the world. Naturally, investing more time in the study of subjects we want to contribute to is important, but having solid foundations in a broad range of domains will enhance our general perspective of the world.
The world is a giant machine composed of millions of components that have resulted in everything we experience today. Don’t underestimate it, and let it kindly humble you in the unending pursuit of knowledge.