Not setting DST automatically is a wise choice.
Even in the same time zone, there are cases where some regions use DST, and some do not. Given discussions I have seen, some regions are considering going to permanent DST, or may have done so. These regions could be countries, provinces, states, or cities - I believe there are examples at each of these levels.
Any automatic setting of DST based on time zones would leave some users with clocks that persistently reset themselves to the wrong time for about half the year.
The most logical answer would be to ditch DST altogether.
The other good alternative would be to go to UTC for the entire planet, simplifying a number of things.
Biting the hand that feeds IT
