Why? I'm very NOT large studio oriented. I don't think anything stated in my post (which is just part of a larger series I'm writing) is even about studio size. In this particular post I'm just broadly breaking down some of the sub-specialities inherent in the process of programming video games. In a web app you need more network and database programmers, in a video game you need graphics and sound programmers. It's just practical sense. The same guys might do these tasks, but if you like advanced 3D graphics and get a kick out of it -- get a programming job that involves graphics!

Those technical specialties are specific to certain genres of games. You don't have to learn all of them to get started and make good games. You probably do have to shoehorn yourself into one (or a few) of them if you want to work on big budget games.