Chances are a person who is making video games has some artistic background, especially if they went to college for it. There's either doing a technical CS major(Math or Physics minor) or artistic CS major(Art or writing minor)
In order to determine whether the game industry needs to consult "outside talent," we first need to agree on what constitutes "inside talent." Video games are collaborative efforts from start to finish. Of course they involve artists, programmers, technicians, business men (marketing, management, PR, advertising), lawyers, etc. etc., but--and we might take a note from Bruno Latour here--the efforts of entire other industries contribute to the causal chain terminating in a video game.
What would greater interdisciplinarity actually look like in video games? Games, we should observe, obey different principles than other art forms. For instance, an architect works according to values that, if applied to, let's say, a dungeon in Zelda, would result in a rather poor playing experience. There is no need for a structure in a game to possess sound engineering.
If we look at some historical instances of interdisciplinarity in games, we will also observe that other disciplines' contributions are meaningful precisely because those disciplines are already interdisciplinary, including elements pertinent to game design. Bioware, for example, was founded by two doctors; however, if medicine today did not have a good deal of overlap with LIS (e.g. bioinformatics), I doubt any such collaboration would have occurred.
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