Fizz’s ultimate mechanic is contradictory

Just sharing my opinion, feel free to debate and discuss about it.

So, the mechanic of Fizz’s ultimate (in my opinion) is quite contraciditory. Fizz is an AP scaling melee assassin. As an assassin your job is to pick off the enemy carries. For a melee assassin to deal damage they must obviously gap close and reach the carry through CCs, shields, heals and etc. Now this is where I find Fizz’s ultimate mechanic very illogical. Fizz’s ultimate’s deals less damage and is smaller when travelling a short distance while when the ultimate travels a long distance it deals more damage and is a lot bigger. To which I find this quite absurd, for example if Fizz has vision advantage and is able to pick off an enemy by hiding in a bush, Fizz is punished for being close to the enemy. A melee assassin that’s close to the enemy should be rewarded and not punished. This makes no sense to me (imagine Talon’s Q doing less damage at melee range and more damage when leaping). I feel as if Fizz’s ultimate should be like Talon’s Q, where the shorter the distance the ultimate travels the more damage it does and the bigger the fish.