Is Kalista's objective control too good?

I feel like having a kalista on your team is like having a better smite.

It completely ruins the mechanic of being able to steal objectives, even if you time your Ezreal ult, thresh hook or smite perfectly, it can't happen when kalista is killing that dragon from 1.5k health with a single click.

That said, I don't know if other people find this as annoying as I do, but if they do, i'd suggest a maximum stack value against large monsters, making it more of a skill to time the Rend in order to safely take the objective.