This oneshot fiesta needs to end in order to save this game. Everyone is oneshotting everyone, not just damage rune users.
People quit playing League because its strategic fights turned into a button mashing Team Deathmatch. The calm aspect of the game completely vanished. You are always in danger of getting oneshot and most of the time there is nothing you can do about it. It is not fun and engaging - it is boring.
Nerfing Electrocute was a start, but it's not enough. Champions need more bulk.