Well, you need to remember that your figure of 5 hours is specific to your location (or at least your latitude). Different latitudes have different amounts of difference between summer and winter.
DST/Summer clock change is complicated enough, there is no point to further complicate things by having different places change different numbers of hours.
Plus it becomes completely useless in the polar regions anyway. And in the tropics, it is more disruptive than it is helpful, since there is little to no difference between summer and winter sunrise/sunset times.
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