@Riot Discussion on Kayn's Ult

What do Syndra, Tahm Kench, Varus, Elise, Diana all have in common?

They have clarity on all their relevant abilities.

So why not Kayn? I love Kayn's kit but I'm seeing a major flaw with his R. I've been in too many situations where it's just not clear to me that I actually can't ult someone after damaging them anymore. Or even that it was about to expire.

One opinion I heard is that being able to tell when it ends should be part of the skill curve of playing Kayn, but I disagree. He has many AoE abilities and so there will be a lot of available targets to ult, especially if playing as Rhaast. Does that mean you're required to keep a timer of 3.5 seconds of damaging an enemy in your head to when you can't ult them anymore?

What about if you just happened to pass an enemy and burned them using sunfire cape? You won't necessarily know the exact moment you damaged them. Maybe this is just me, but it also feels like the graphic that does show that you can ult someone seems to lag a bit and stay on an enemy even though it has actually expired. But that could again just be what it feels like due to the lack of expiration clarity.

The duration Kayn has to ult an enemy doesn't necessarily have to change, but I think a bit of clarity could help the plays be a lot more consistent. Being told I have to damage an enemy after mine and my team's plan depended on me taking initial damage and focus in a team fight and then ulting their carry at the last moment sounds a lot less preferable than a simple animation and/or slight colour change to either the graphic on the ultable enemy, or even the distance line showing who it is you can ult.

What do you think? Is this a worthy addition, or is this actually intended to be something we should keep track of ourselves?