User blog comment:Lukeatlook/Pyro's Item Overhaul 5 - Supports and the CDR Overload/@comment-5266525-20140719194404

I personally never quite got why CDR was capped at just 40%. The only other stats with hard caps are attack speed and critical strike chance but those caps are so high you really have to be deliberately building towards it to max them out. 40% CDR is so low and the stat is so plentiful on so many items that it ends up stifling build decisions on champions who would love to build lots of items that grant it.

Could CDR be reworked to function like Tenacity where the stat isn't hard capped but suffers diminishing returns as you build more of it, alongside general nerfs to the CDR numbers across the board? This would aim to make CDR less restrictive in an endgame build and allow supports to distinguish themselves further from certain mages and bruisers who might also like maximum CDR. What possible problems could arise from this?