I always thought they had it backwards. The extra hour should be the fall and winter and the standard time for spring and summer. I dreaded the change when I delivered for UPS. Busiest time of year from Thanksgiving to Christmas and it was getting dark by 5 PM. I usually had 2 to 4 hours left on my route.
It really slowed progress for in town deliveries and was sometimes scary for rural when crossing a mountain with no one around for 20 miles. Snow coming down, road slick, truck heater struggling to keep truck cab above freezing, dual tire chains banging, creeping along at 30 MPH, thoughts of a warm dinner at 9 maybe 10 PM fading, and still miles to go.
An extra hour of daylight would have sure helped.