True, though there are many other application domains where nonfunctional (i.e. non-"domain") requirements are at least as important as the domain modeling itse

True, though there are many other application domains where nonfunctional (i.e. non-"domain") requirements are at least as important as the domain modeling itself. Search at Google, scaling at Twitter, any chip that powers your car's airbag, ... So game programming is not a different animal, it's just one of the domains where performance is a lot more relevant than for more mundane domains.