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But I don't think parallax itself causes any error directly.
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It directly causes a shift in the POA. It does not effect ballistics but starts the whole process off on the wrong scale.
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Parallax is more of an issue for close distances.
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Depends on the optics. Distance comes with a larger displacement so it does matter. A small angle makes for a larger displacement the longer the distance.
Yes, it is a big deal for red dot sights at close distances as all red dots have parallax due to their physics. That is why stock weld and head position are critical as well as one of the major advantages of holographic sights.
https://www.greeneyetactical.com/201...ight-parallax/