[burroisolator]

I would be interested to know myself. My guess is that the cost of upgrading libraries isn't that expensive. Library maintainers probably have to change things every couple of years anyways when new countries get added or a country changes timezones. Removing DST would just be yet another change but slightly larger in scale. I would assume most of the cost would be from people assuming that DST was in effect, and as a result being late to something important.