Ok, let's try to look more into the stats. Dazzling Gleam is used in about 35% of all Koko sets and it's a move I think we can both agree that is used almost exclusively on the Specs set. Electrium Z is Koko's most used item at 21% and Specs sits in 3rd with around 17% usage.and like I said, timid encapsulates a significant number of sets, not just Z electric, so you can’t exactly make an assumption off of pure usage stats like you are and have it be adequately educated. Additionally, Naive is most certainly NOT the most optimal nature used on Z Wild Charge. One of Tapu Koko’s biggest draws in the current metagame is its ability to check Torn-T arguably more consistently than anything else in the tier so throwing that away to do increase your damage output by such a slim margin is very stupid. Not only that, but a fair amount of people on the higher portions of the ladder have begun to run tbolt over taunt on dual screens as to not be sitting ducks in front of certain offensive threats and limit the pool of mons that wanna be out in front it of to ease prediction. These factors combined make your point that “no one runs jolly on z wild charge it’s only on screens” pretty silly as well all things considered. Z tbolt is easily kokos least common set at the moment besides maybe scarf and you’d be well served to do actual research into the pokemon you’re making statements about instead of making very flawed assumptions off of usage statistics
Wild Charge on the other hand is only used in 18% of all Koko sets and while I agree that the vast majority of Wild Charge sets run Electrium Z, the math just doesn't add up since it's move usage only makes up slightly more than half of the usage that Dazzling Gleam gets. If Dazzling Gleam is Used in 35% of sets and Specs is used around 17% of the time (also giving you the benefit of the doubt and not counting the times a different move like HP Ice or Roost gets used over Dazzling Gleam in the Specs set) Then Wild Charge should be seeing higher usage than just 18% if It's really much more common than the T-Bolt set like you say it is.