It is outdated and has no value added. It affects people's health by throwing off their body clocks. Each year families have to go through adjustments with their children and their own work schedules.
These twice yearly changes cost industries millions of dollars, e.g., airlines, trains, schools, to change their schedules.
Households now have much more than one clock to change and not all time pieces are automatically changed.
A common sense change of splitting the one hour to change it just one half (1/2) hour to keep it standard for the USA.
It is useless.