That is because the team picking them almost always sucks, though. And someone usually need the guy to play well to avoid being fired. No, its because teams need to make a decision after year 3. For first round picks, the 5th year option needs to be picked up or refused after year 3. For other rounds, its the last chance to get an extension before you enter the franchise tag arena of Kirk Cousins. The 5th year option is still a sizable amount of money for a QB (over $18 million I think now) so you are basically at nearly commitment level. If you don't pick up the option then you again are at the mercy of the franchise tag after year 4. You really need that 1st round QB to be starting by year 2 to even hope to be able to evaluate him fully by the end of year 3. Choose wrong and you have $20-30 million on your cap you are trying to kill off if he is bad or you now need to to try to work out a deal with a QB who is looking at getting franchise tag money for one year after you thought you were going to move on and he performed.