allow custom renderings of chart objects, e.g. bars in bar graphs
So rendering of a bar would be achieved by way of a callback to the user's own code (possibly)
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There is a method Series.prototype.drawPoints. You can create your own version of that to draw the shapes the way you want it.
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Oleg Martinez commented
Or a callback function in order to create some custom output based on some parameter, ex: change the alpha color for selected points.
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There are lots of methods in Highcharts that can be overridden, for example Highcharts.seriesTypes.bar.prototype.drawPoints.