Why is tryndamere still a thing...

this is a rage rant post but why are invulns like trynd ult and kayle ult still a thing. they might be the dumbest abilities in the game besides crit. and when you combine 2 of them in 1 champ its just stupid. the only counter to either of them is cc or a lucky ignite. if your gonna have invuln abilities in the game they should act like zhonya's or aatrox's passive not click a button and you have so many secs of free time where you jump on the nearest carry and kill them.