They aren't necessarily tiresome. Some people can play games all day without hurting themselves.
Musicians learn to avoid building up muscle tension, both in the muscles they use, and sympathetic tension in the muscles they aren't using. They learn to keep good posture, keep their wrists relatively straight, to breathe properly and so forth, and these skills get passed down to new musicians.
The same skills apply to video games. But there's no "classical video game technique". People tense up, have terrible posture, and generally do things that will hurt themselves if they keep it up long enough. It's totally natural, and takes training for most people to avoid it.
I'm not proposing any particular solution to this, but I think some basic training might help with the sort of people who injure themselves playing video games. Certainly the ways to avoid RSI are non-obvious, whether you're playing Street Fighter or sitting in an office typing all day.