Why is there no character level and equipment based restriction on queuing for Operations? 

This is by far the most frustrating thing that plagues this great game.  I have seen characters under level 10 queuing up for Ruthless and Lethal difficulties. Last night I wasted over an hour trying to end up with a properly levelled group, it was so frustrating. It seems  like with time  there are more and more low level players  queuing for high difficulties. 

Its getting worse with time so I really think there needs to be a character level and equipment based restriction for PVE queues, especially for higher difficulties.