Live press conferences regardless of the message have been going on for many many years to get the message out. When regular scheduled programming is interrupted ( to the dismay of some ) then one knows it is a big deal.For what purpose? There's no helpful information to disseminate that can't be posted on a website and social media where more people will see it anyway.
These types of press events are just dog and pony shows to make the person speaking look engaged and keep their face on the local news.