I came to the game early in season eight and have never changed from overheal and I take it on most champions. Why don't people use it, it is such a good rune for taking trades in and out of lane and it allows for extra lane security. Fleet Footwork, Overheal, Alacrity and Coup de Grace with Absolute Focus and Gathering Strom is the best rune set in my opinion for most if not all ADCs. So why do you take Triumph? In a losing situation it is not going to be useful and wont allow for that snowball which everyone uses it for. In a winning lane it can be useful for the snowball yet you can still snowball with Overheal and it doesn't become near to useless when behind. For kai'sa especially, less skilled players may find themselves going behind as she has a large skill curve to an extent. Kai'sa, in my opinion, is far better with overheal as she can trade with Q against a single auto-attack neglected by the overheal shield. What is the problem with overheal?