It could be sort of neat if there was a convention for all news agencies and press rooms to queue up all their stories and release them after the end of the business day.
Why advantage parties that can process in less than 12 hours? Rushing analysis just makes it worse.
traditionally, the weekend gave even more time to sleep on it. modern near 24/7 trading makes that less of thing. back when the traders went home, there was a cooling off period. just like the circuit breakers to stop trading on big loss days to get the humans to stop and think for a second/minute/overnight. the high frequency trading doesn't have these emotions to cool down from, so it's still something that seems to be done on tradition now.
it's the custom because it's not just stock trading that they care about, it's brand/image, and weekends give the story time to disappear from the headlines, being replaced by new stories. Fewer people are paying attention to the news over the weekend.
If they had top leadership accounts and service accounts hacked just by password protection sounds like a major security fubar.