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After Russia cancelled DST, various websites (e.g. WolframAlpha) and software would return wrong time in Moscow for years. My phone's clock widget still gets it wrong (I had to change my location to Kaliningrad). I don't think 3 days makes much difference.

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When Bush changed the date, our company had millions of hand-held wireless devices that had to be updated. To avoid that debacle again, we made them contact a DST server (instead of hard-coding the dates). Because updating handhelds was a miserable process requiring retrieving them all and docking them.

Russia also doubled amount of DST related problems by first making DST shift permanent, then canceling it after couple of years.

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