This is where I disagree, and I know I'm in the minority (clearly) by how popular streaming has become. Professional athletes are marvels because they
look so much bigger, better and are faster than the average joe. That's their appeal - they're real-life super heroes. LeBron, Jordan, Ronaldo, Ali, Jim Brown - they guys are living, breathing physical specimens who can do what no normal person, no matter how much training, can accomplish.
Video gamers, while no doubt skilled and dedicated to their craft, look like regular guys off the street. There's no wonderment. It's why nobody has the world chess champion as a poster on their door (or desktop background, whatever today's equivalent). Poker is popular on TV too, but ask a kid who they want to be when they grow up, Messi or Phil Ivy and I'm pretty sure I know the answer.
This stuff is popular and more power to those who succeed, but I think it's unfair to just brush off people's bewilderment at the success of esports by trying to compare some 19 year old "esports athlete" to a proper athlete.