Ever had to implement a timezone aware software application?
Ever had to deal with DST support in said application?
The suffering involved is reason enough for DST to go the way of the Dodo...
Making timezone calculations in an application is ridiculously painful even with helpful TZ libraries. In my last program I just decided to ignore DST in my calculations and just fudge everything. This is particularly annoying because it needs to calculate the time in New York, but the computer it lives on is currently in Norway and North America and Europe switch their clocks at seemingly random times each year.
For this particular program it doesn't matter *too* much, but it does lead to weird failures occasionally. Fortunately it's not in a production environment, it's just something that runs around the house.