Not everyone has 100s of hours free time to sink into this and that skill
That's life, buddy. Nobody can learn everything, so communities rely on specialists who can master their craft. Would you rather your doctor have 100s of hours of study and practice, or a random person off the street with ChatGPT? If something is worth studying for 100s of hours, then there's more nuance to the skill than any layman or current AI system can capture in a few sentence prompt.