It's more about job seeking than anything. If you jump on a fad early, and it turns out to be the winner, when you're looking for work you can say you have X years of experience with it, which will be a few more than most of the other candidates.

It also shows a passion for learning and improvement, something hiring managers are often looking for signals of.

But of course it's a trade off. This rewards people who don't have family or other obligations, who have time to learn all the new fads so they can be early on the winners.