@Riot, How often is skill speed execution considered?

Was just playing a game of URF and it occurred to me the huge difference the speed at which some skills are executed compared to others.

As I pondered this, I realized maybe going over each champion and looking at how fast their skills are executed can help balance some champions. What if Katarina had a small wind up time for both her shunpo and ultimate? Meanwhile other champions like garen, darius, xerath, who had a huge wind up time for their ultimate got it reduced? Obviously some champions have wind up times for a reason like fiddles ult ( you get a free flash and AoE that continues through a zhonyas)

I understand projectile speed is a huge balancing factor with skill shots and I feel that point and click and even AoE moves should have this considered more often in the balancing process. Some champions who are barely outside the realm of rather viable might need a boost in ability execution speed meanwhile other champions who are grossly OP, if you tuned the speed at which they used their skills, would be more reasonable.

Just a random thought