Why are renekton's cooldown so high?

renekton is an ad caster with not much sustained damage at all. hes bursty. but not the greatest burst out of all ad casters. it doesn't take much of a loot to see his cooldowns are just too high compared to other champions in his class. manaless or not. he has higher cooldowns.

if we compare renekton Q. to its closest similar ability. darius Q. which are both fairly similar abilities that deal aoe damage and heal. renekton heal is minute compared to darius. and so is the damage. meanwhile it has a 3 second higher cooldown at max rank.

renekton's aa reset. his W. has a 9 second cooldown at max rank. wukongs had 5 second cooldown .

his E. which if we compare to riven. has more than twice the cooldown. and does not grant a shield. 14 seconds to 6 seconds at max rank

and you have the 120 seconds ult.

renekton is strong early game. but falls off harder than even pantheon i would say. but even he isn't as strong as early game darius yet even darius outscales him.

i might be comparing oranges to apples but there is nothing else i can compare him to closer than other champions in his class. point is. renekton cooldowns are too high. if u take a look at his base stats they are meh. his abilities have meh damage damage. u have to build damage to basically do damage. give him lower cooldown on his Q max rank. and E.

or give him lower cooldown on his ult. make it scale per rank.

120-100-80. and make the E cooldown 11 seconds at max rank.

improve his mid and late game. keep his early game. am not asking for a hypercarry but a champion that doesn't quite become useless very soon