IMO what should happen is instead of CDR in % we get 3 affixes that are CDR related but in seconds:
- Defensive skill CDs reduced by [1-4] seconds
- Offensive skill CDs reduced by [1-4] seconds
- Ultimate skill CD reduced by [4-10] seconds
And perhaps try to “specialize” people in that direction… If someone wants to “spam” Ults, they can get that down to like 20-25 sec. CDR but not literally have a 100% uptime (or if they do then they have to sacrifice a lot)
Or if people want to “spec into” perma-defense (or seemingly perma-defense) then they sacrifice something else in return
It’s also much more intuitive that way
I mean what exactly does it mean to get 16% CDR ?, just take that “page” from the D2/R book where no “gradient calculations” exist and things are much more intuitively calculated in seconds (as opposed in %) and don’t offer generic/universal bonuses (unless in a couple/few uniques) and think we’re fine 
If I were asking for some S6 specific changes this would be one of them (also perhaps reduce rune power a bit so they’re more situational as opposed to spammable by default and then add 2 more affixes)
- Rune potency %
- Rune power %
On gear