Pro gamers don't develop videogames. It doesn't mean they're incapable of developing videogames, but they hone their skills in playing them. Their skills can transfer to mastering other games much more easily than into game design or development. If they began developing videogames, then they're Pro gamers who are also Developers. If they're making videogames, you wouldn't only refer to them as a Pro Gamer. Again, nothing is mutually exclusive, and nothing implies skill or lack-thereof.
Unless you think all Pro gamers are shitty Game Developers.
It's not unsustainable, because it's literally the difference between a Class and Profession. There have been parts of my argument where I specifically say Technology Class and Engineers, so if you think it's terrible and unsustainable, you're the one who can't seem to tell the difference.You're making a terrible, unsustainable argument in an attempt to create a distinction between Tinkers and Engineers, and the simple idea that this is your best argument for them being two separate things, actually only makes the idea that the two are the exact same thing, even stronger.