Leveling up Kalista's ult

I analyzed Kalista's kit on the league wikia and I habe been surprised by her ult: besides the cooldown reduction, leveling up the ultimate doesn't improve anything. Isn't that quite unsatisfying? Couldn't it increase the range of the dash, the range of the ally's teleport or the time of untargetability? (It is just a question, I didn't play Kalista myself)
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