User blog comment:Care Level/A couple of New Items./@comment-4068613-20140506160529

Flat CDR is difficult to balance. Many champions with low CD basic abilities would be utterly broken by this. Trundle or Nasus for example, having their Qs on a .5-second cooldown.

Actually, now that I think of it, champions like Trundle and Nasus could keep the active up permanently just by only attacking with their Qs.