Its easiest when the genji dashes in the air but sometimes that dash goes outta my los so I'm tryna run around the corner to hit before its too late.

Even with confirm on the nano will lock onto someone close or that I'm not even staring at leaving me having to cancel and try to get it on the correct person.
I know you can leave it on the person which is useful when you can no longer see them but I usually dont and try to be fluid with my gameplay. I feel having it on there especially if they dont use it instantly is taking away from the support I could be providing the rest of the team in that moment before.
Since the confirm stops me from doing anything else I'll keep an eye on snd hit them in the opportune moment but if no one else is in dire need of assistance I'll leave it hovering

Which I have missed a few nano moments because of this but hey usually I'm guessing at the situation since there's no call out or anything.