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If we detect certain events that indicate a touch device is present, we adjust some behaviors to account for this. The problem is, there isn't really a foolproof way to do this, so there have been a couple cases in the past where browsers have reported touch capabilities when they weren't, though these have generally been fixed by the browsers. Equally, it's very difficult to truly know what input method is being used (at least without doing some crazy things that we wouldn't want to do), so we basically need to rely on these not always perfect tests.

If a browser starts reporting touch elements, it's usually coming from the OS itself and may indirectly be coming from the hardware (like a touchpad). Unfortunately, we can't do anything because if the OS thinks there's a touch input, the browser will expose the touch APIs and then we'll adapt. Maybe this will change in XF's future.