To the guys who see you can buy
+
to get 40% CDR at a not too high of a price... well, you are right about that.
However, the real problem is another one, in my opinion, and i will point it out clearly:
An ADC buys
and then get a lot of CDR simply buying other items that are optimal and he would want anyway.
On the other hand, an AP champion can surely buy
+
, BUT doing so it's not optimal, because you are spending gold to get more mana reg than you want, and giving up AP, which means damage, to get that 40% CDR. You can also go for other items, like
, which is very good, by the way. But then you are giving up on the 15 Magic penetration from
. Every choice AP mages can do to get more than 20% force them to give up on something. That's not wrong, really. It's just that people get annoyed by the fact that on the other hand an ADC can get extra CDR while buying items that he would want anyway because they are optimal.
TL,DR: the problem is not about being able to reach high CDR: what peope are getting annoyed by is the fact that AP champions need to give up on some usefull stats to get more than 20% CDR (like more AP if you get morello + athene, or magic penetration if you get lucidity), while ADCs have an item that let them have a lot of CDR while buying optimal items, thus not giving up on anything, really.