I can see that "pro" sim racers would be driving so close to the edge that 30fps seriously degrades enjoyment. Where lap times hinge on hundredths of seconds, one frame every .033 of a second is a lot different to one frame every .017 of a second, and probably for the best of the best sim racer players 60fps is a bit sluggish; a frame every 0.0083s would be better.
But for the less serious gamer wanting to just have fun blatting around race tracks I don't see why 30fps should be an issue.
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