Quicksilver Sash/Mercurial should not exist.

These items encourage poor positioning from the AD Carry champs who typically build this item, covers a weakness (crowd control) meant for certain hyper carry champions , punishes Flashy plays, and most personally frustrating invalidates a large portion of certain champions entire kits .

Focusing on the latter two complaints, a flash into range to cc a high priority target that is_ out of positioning_ often times ends up as a 1 for 1 trade depending on how quickly the enemy team reacts. QSS completely punishes that play and can lead to a lost teamfight. Even worse this item set punishes suppression champions that CC themselves whilst CCing the enemy target. Of the four suppression champions (Urgot purposely left out since his suppression is unique) two completely immobilize themselves to become sitting ducks while the other slows himself significantly. In a world where these players have the option of and for risky plays why should they also have the option to also completely disregard crowd control? It's time to remove these items from the game.