It allows you to capture the gains of the market.
Trading lets you beat it. In that zero-sum game, 10% of participants win, 90% lose. Are your skills in the top 10%? If not and you're still winning it's due to luck. Unfortunately being on the right side of luck degrades over time.
Experiencing how markets work is a modern day life-skill.
The world runs on markets. Buying a house, saving for your retirement, living abroad, you'll be exposed to markets. When learning to trade, your goal is to maximise the amount of lessons per dollar you lose.