Looking at this from a 'Unix in Europe' perspective, the timezone data has rules. So as long as the rules don't change you don't need updates. And due to the need to coordinate with many countries, timezone rules in the EU essentially don't change.

It seems that in some countries, time zones just change randomly. Maybe people should just stop doing that. Countries only move a couple of centuries a year. And there is no reason to mess with DST other than to get rid of it all together.