I also think the new colors are more difficult to tell apart. I understand they had to do something about the EP colors but why couldn't they just settle on recoloring the existing EP icons to one color which is easy to tell apart from existing GP and SP colors and leave those as they were with a colourful background.
I was always annoyed by the similarities of the pack icons in sims 3. So when I first saw the icons in sims 4, they were a big improvement for me. But apparently that was just coincidence. Now the icons are less recognisable and EP and GP are just a different shade of nearly the same colour.