The NYSE is closed between 16:00 and 9:30, plus all weekends and bank holidays. AFAICT real world information doesn't stop in the closed hours. So how is it cr

The NYSE is closed between 16:00 and 9:30, plus all weekends and bank holidays. AFAICT real world information doesn't stop in the closed hours. So how is it credible that it's super valuable that trades can happen during the open hours at sub-second resolution, but we're suddenly ok at 16:00 with a 17.5 hour resolution?