All the problems currently can be traced back to assassins and their items...

Yes, is a powerhouse at the moment but he always have been, but that is directly because AD items have been super powerful for a long, long time and half the ADC's on the roster are almost nonviable because assassins are so overpowered, mobile and generally unfair to play at the moment. The reason why champions like now and other immobile ADC's cannot be played is because they have nothing to deal with an assassin one shot from a or and cannot stop an assassin from escaping with the free mobility they have every few seconds.

, etc, all have high one shot damage themselves because that is the ONLY way to counter the massive mobility of assassins which are spammed EVERY game pretty much.

So the current problems with and can be DIRECTLY traced to the fact that Riot love assassins and are doing everything in their power to make them the most versatile and powerful class in the game.

Its sad that ADC's are forced to cheese out a one shot just to stay on EQUAL footing with the current assassin line-up and even then if they get close, you are pretty much dead since can pretty much miss everything and just ult + for a free kill.