Why does Ekko's W need to be invisible?

After playing many games against Ekko, I've come to appreciate ways of working around his kit that I had not initially seen and i do feel even if he's a bit overtuned he has weaknesses to exploit and all of that

The one part of his kit that has me screaming bullshit every game is the invisible nature of the first part of his w. Yes, you can see the clone, but you don't know where he's gonna shoot it until it's on the "flash or get stunned" window, and if he shoots it from out of screen your window to react is even smaller. And the Ekko player can just randomly throw that thing wherever when he's in danger because often that can force you to back off since you don't know where it's going to land.

And I don't really see what are the positives this way of handling the spell brings to his kit or the game overall? Variety is nice but not when it's at the cost of good gameplay and there are definitely different kinds of mindgames you can pull off with regular skillshots. There's nothing **positive **about this spell that you couldn't pull off with a regular skillshot, so I'd love gypsylord or someone to drop by if possible and comment on whether that's being considered as a change for Ekko, as I think it's singlehandedly ruining a very cool kit that would be really fun to play against if not for that (needed nerfs notwithstanding).

Make it visible and compensate, maybe reduce the travel time, extend the slow into stun/shield window, etc.