I think Riot's clock is running a Little late, Jett Surely needed this Nerf But I think at this Point Killjoy is the queen in the Current Meta . Her Pick rate in Champions 2023 is around 64% . And TBH Killjoy meta is so boring to Watch. Just Increasing her Ult with 1 orb won't do shit. Players can still farm orbs and currently The 2 best player in world are Killjoy main ( Alfa and Less). They will surely get 2 Lockdown per half .
I think her kit needs a Nerf
Reducing her Ult range or Decreasing the Detained time would be a good fix. And Her Turret is a very annoying to play against .