As someone who dislikes Kalista's Passive as both a Kalista player, and Opponent...

Kalista's Passive should have to build up before you can dash and Auto-Attacks should be cancel-able up until said dash is available.

E.g. Auto (Can Cancel), Walk, Auto (Can Cancel), Walk, Auto (Can't Cancel), Dash.

Kalista's last-hitting always feels so clunky and not being able to cancel Auto-Attacks makes me miss so much cs or take free harass when an AA accidentally starts. I honestly can't go from playing a regular AD Carry to Kalista without losing my sh*t trying to get used to her passive.

But then people who exclusively main Kalista are just ridiculous and you can NEVER touch them without having some ridiculous team comp like Vi + Orianna + Yasuo that literally can't miss their ults and can instagib her.