There's a difference between playing games because you enjoy them, and playing games to the point you can make a legitimate living off of it. There's no "self-glorifying" aspect that applies to gamers as a whole with the term e-sport, I think most people realize video games are largely nothing more than an escapist waste of time, although tbf a much more mentally active one than passive TV watching. Still, some person can make money off of their hobby? Good for them, they can call it virtual gladiatorial conquests of e-strength for all I give a shit.
Should be interesting going forward as video games become more and more realistic. I mean, if you could watch a bunch of 50 tall mechs battle each other and destroy an average sized city and it looks realistic and it carries the same competitive edge, personalities, tribal team feeling, all the little elements that play part in every "sport", wouldn't that be a lot more engaging and exciting than mere meatspace reality? It's a bit reductionist to say gaming is nothing more than muscle memory incidentally. The meta mind games alone are a huge part of gaming, without even bringing into it the obvious tactical and strategic planning most competitive games require.