New qss item

So I've been thinking about this for a while, how come quicksilver sash or qss can only be built into one item: Mercurial Scimitar. For something as useful as quicksilver sash which gives magic resist, why wouldn't they make an item that grants health and magic resist with a qss active? It would be useful on tanks and allow for less chances of dying every time you get caught. Also I guess an ability power item involving the qss active would be much too overpowered considering cc is the one thing that will stop an ap assassin or Mage from one shotting everyone in their path. I don't know just my thoughts lately. Especially with dusk blade of drakkthar coming out (which will wreck tanks) another use for qss should be in the game in my opinion. Mikaels crucible is an item that is basically a qss active but nobody but a support would build that considering its stats aren't great at all. Is it just me thinking this? Or does someone else think qss should have another build path.