User blog comment:Lukeatlook/Pyro's Item Overhaul 5 - Supports and the CDR Overload/@comment-5035765-20140721000242/@comment-1330314-20140723121956

There used to not me as much CDR availability, and that was bad for supports because their itemization was even more limited than it was now. Reducing the amount of available CDR on support items has two main issues:
 * 1) CDR is essential to supports, and is the stat they are expected to rush, in addition to bulking up on utility. Reducing the amount of CDR options would limit supports to a smaller pool of viable first items.
 * 2) Likewise, CDR can act as a limiter to how many items with powerful actives you want to have on a support, which is a good thing: too many top-tier support items without CDR means supports would be able to (and, by that, they'd be required to) build those in every game regardless of their previous item purchases or intended build. This used to be a serious problem previously, and even now still persists to a lesser degree. Supports should be able to have power of their own through their inbuilt utility, and shouldn't just be item bots.