@Riot, please bring back Oracles to Summoner's Rift.
I feel the current vision system is pretty lackluster when it comes down to dealing with stealthed champions, especially assassins. The limitation of pink wards and their blatant visibility have crippled counter-mechanics against those champions severely.
As a midlaner it's impossible to ward both sides of your lane with pinks, neither can you secure vision in every single brush since you're restricted to having only one pink per champion. The sweeper-trinket is more or less useless against stealth-junglers since their ganks are extremely unpredictable. It gets even worse once said stealth champion is fed, from that moment on you're dead the second you encounter one.
So where's the counterplay which you value so much? Because I don't see it.
. That's quite a bit of Olafing from just one item...