There are so many non viable champions because of kiting. Some champions are ancient in high elo );;
We could use anti kiting item....
Something along the lines If enemy jumps you get to jump/warp to them but you are grounded for couple of seconds after (Lets face it riven/yasuo/renekton/fiora so that t . Formula could be 600 + 90% of their dash lenght
If anyone remembers when yasuo was able to ulti to tristana jump and jumps in general. Well this would be similar except you dont cc them or dmg them you just follow the distance
but you are grounded for the next 3 seconds (You can still use ms boosts) (To prevent riven/yasuo/renekton/fiora and alikes from using it)
This would help

And how much play are those seeing specially in high elo.. They are completly unplayable in teamfights and for that reason seen as boring and in need of rework
An item shouldnt give AP/AD or we can make both AP and AD version specififcly balanced
Blablablauu builds of cloth + mantle + saphire + gold 300 hp 35 armor 35 ressist
- unique active while your enemy is dashing/jumping/nlinking you can blink to follow them as I already said 600 + 90% of blink, dash range is suggested number which can be reduced or increased if need be
Activation time. You can press it 0.1 second in advance or after dash and it ll work. So you have 0.2 seconds + dash/blink duration to follow up on them Hardest thing to react to would be well Flash because its instant... Then Kassadin R, Ezreal E (atleast they have cast times)
I know this would fight mobility creep with mobility creep but there are no alternatives at this point
If we can have AOE shields, Aoe true dmg heals, Zhonyas, Protobelts , and bunch of other active items. Why cant we have an item which would help melee immobile champs reach something

Also none of the champions above can buy any zeal line item, Ludens, lichbane so they are naturaly slower
or
and proceed to fuck your shit up with just that, while being more mobile and in some cases much more target agnostic with % damage in abundance