When (and why) did UPS screw up their package tracking website?

Previously, their UPS tracker would give you detailed information about every step of the way:

March 12 4:00pm picked up
March 12 7:00pm Sort center in Dubuque
March 12 11:40pm en route to Chicago
March 13 5:00am Arrived Chicago
March 13 7:00am Departed Chicago
March 14 2:00am Arrived Columbus OH
March 14 4:00am Arrived Suburban sort center
March 14 5:30 am On Truck for Delivery

Now – the only show the top one and the last one – they no longer show the intermediate steps.

Why did they change it?