One of the realizations I have made is that hobbies are a sign of privilege.
Some people dedicate themselves to board games like Chess and Go.
Some people dedicate themselves to hitting a ball back and forth like tennis and Ping Pong.
Some people dedicate themselves to weapons that we no longer use in modern society, such as those found in HEMA (Historical European Martial Arts) or Kenjutsu.
Despite all this, so many people have lifelong pursuits towards activities that do not solve world peace or world hunger. It doesn't explicitly make the world a better place.
Many humans are so well off that they can afford to do activities that are unrelated to survival.
There exist tribes where the word "exercise" does not exist in their language because physical activity is naturally woven into everyday life. The idea of dedicating a period of time to waste your energy by moving around is foreign to them. Yet humans are so well off that in most societies, the word "exercise" exists as a concept. But to hunters and gatherers, this is a foreign concept. In their life, running on a treadmill probably sounds like a waste of energy.
There are so many hobbies (not related to martial arts) where I think: "Wow! That seems like a waste of time." Yet, people do them.