Imagine how useless riven would be if she had cooldowns

...Even though cdr is easily rushable and accessible now compared to, lets say, 3 years ago? Not to mention the rune stats buffed her early game while every good counter around her got hit with a nerf bat. Her kit is a kit that hasn't been adjusted to the new system at all. Same with Jax. Both of them are abusing Conq + DD + Spear (depends on if they want Spear or not, just mentioning it) because their kits were never taken into consideration. Spear is only good on Jax, Riven, and Ren because they easily get the most auto resets off on top of having much shorter cooldowns and such strong kits when they are not gated behind cooldowns. The cdr idea was nice in concept, but with how things are, its not the right time.

Yeah, only the damage part. Its might make a bit of difference, but in the grand picture it doesn't do much when offensive stats are super accessible and better than defensive stats (not by a little, but by a mile and a half. Armor Pen change is the main reason)