But that's not in line with those studies: I'd expect people in Eastern sides of timezones to prefer DST, which certainly includes cities like Boston or New York or Washington D.C. And vice versa, those in Western parts to prefer standard time.
Still, even if we allow for 9-17 employees having these preferences, they'd be waking up in the dark hour (somebody mentioned Sun rising at 8:30 in SF in late December with DST, and 7:30 without, which still precludes most of non-white-collar jobs too, and depending on the commute, some white collar jobs too).
Not questioning you, ofc, just wondering why none of the stuff adds up? :)
As for HN demographics, I am not sure that's true: while they are mostly white collar workers, they also get a lot of flexibility so they could probably just get up a few hours earlier to start working for more afternoon daylight.