This is 100% true. Which makes you wonder why teams invest so much into a scouting department and invest so much in draft war rooms, etc. They are literally no better at picking quality players (at least in the first couple rounds) than most any of us.
I have always felt that scouts evaluate quarterbacks wrong.
They seem to be like fans - they always fall in love with the big arm and the tall guys. And the newest fad is the guys who can run around a lot.
My own personal theory though is this: the guys with the big arm tend to rely on it too much to throw their way out of trouble and never really spend the time learning how to properly read a defense or dissect a defense as a quarterback. Instead they just rely on checking the ball down field.
The guys who don't have that God given gift of an arm are the ones who actually have to learn how to work within an offense and to dissect the defense.
These guys actually would be far more successful quarterbacks in the NFL, except that some of them just don't have enough arm to pull it off and the ones that do have enough aren't given the opportunity because even though they have enough, it's still not comparable to the guy who can throw 80 yards.
I think the issue is that more important is placed on the physical traits instead of the mental ones, and the NFL scouts quarterbacks all backwards.