The key difference is at those points where it dropped to 55-56fps, on default vsync settings you may well have dropped all the way to 30fps. Which causes stutter as it changes and you’re left looking at a relatively low frame rate until it can maintain the full 60fps again (at which point you get the stutter again). On some rides these changes can be frequent and they’re really, really distracting. Whereas this way I’d be surprised if you even noticed the drops on that ride, which would have only resulted in minor screen tearing - probably for a matter of seconds.
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