Kalista's Ult Control

Is there a reason why Kalista doesn't fully control her own ult?

Speaking from the perspective of a support, it's extremely frustrating when she ults in the middle of a team fight. I'd much rather have had Kalista be in full charge of her ult, timing and direction, and just use me as her bowling ball.

Honestly, between skills, and support active items, the last thing I need to be worrying about is using someone else's ult properly.

I'm not a high elo player, as some people may point out, saying it's just a lack of my mechanical ability, but that is exactly why it shouldn't be up to the support. It's someone else's champion choice.