Number of items/materials needed to upgrade = Decreased
Drop rates of items/materials = Decreased
It simply means that the Devs are increasing the value of the items.
If anything, it’s quicker to upgrade heroes now.
Back then, it took me a full week to upgrade a single hero to platinum, but now I upgraded Salvatore and Clyde (or Cayde-3 get the Destiny joke lol) both in the same week. In both of these times,I play all the time for a full week.