Although I dislike the current damage/mobility meta of league, what disappoints me more is how easily accessible CDR is to champions that don't need it. Champions made around burst such as Zed or Annie are achieving 40% CDR without a sweat while tanks and Supports are lagging behind in terms of CDR progression.
League was originally balanced with CDR being the main scaling factor for tanks and supports as it allowed them to spam their strong spells with poor scaling making them effective late game.
Now that CDR has become easily available to damage dealers, supports and Tanks have lost the unique utility that made them more valuable as games progressed beyond the 10min mark since characters like Aatrox now have better CC than tanks.
If League wants to keep Tanks and Supports more relevant in the game, offensive CDR items need to be nerfed hard.
If those Champions need CDR to be viable, balance those Champions CDR, but don't make tanks/support suffer for it.