I agree that Keenum is not noodle-arm.
On the other hand, for whatever reason, his throws demonstrate little velocity. Never will you see a throw "on a rope". That said, I haven't seen a real limitation on the distance he can throw a ball. But he has to get his body into the throw for it to get to where he wants it; just watch when he's hurried and not in a good throwing position and usually the ball winds up short if it's more than 10 or 12 yards down the field.
The issue is that the faster the ball gets to its target, the harder it is for a defender to react to it. And, if the pattern is in out pattern that necessarily guides the receiver to the sidelines, the sooner the ball gets there, the more opportunity for the receiver to possibly the turn the ball up field instead of catching it moments before going out of bounds.
Even intermediate out patterns that Keenum throws have a lot of arc to them. His long ball especially comes down with a parachute. He throws a pretty decent long ball accuracy wise. But the ball takes a long time to get there, so the defender has more time to react and adjust.
I'm not ragging on Keenum. I'm one who has defended him and agree with the decision that he ought to be the starter for now. I'm only saying that compared to strong arm QBs (and if you watch Goff, his balls come at you "on a rope"
, you see the difference and all other things being equal, why it matters.
Bottom line on Keenum as I see it:
He's a gamer.
He's a good leader.
He's a student of the game.
He manages the game pretty well.
Seems to stay healthy and thus available.
He's more mobile than you might think.
His accuracy is NOT consistent. Way too many open receivers where the ball is well off the mark.
He does not throw with velocity.
His shorter stature makes it a bit tougher to see the field.
And he does not always seem to see the field well.
And assuming he does have the right to change up plays at the LOS, he doesn't seem to do so very often. Too much he runs plays right into the teeth of the D.
Keenum is like Fitzpatrick: marginal starters/good back-ups. They both will have/have had long careers as a result. This is the reason that even when given a starting role, their teams are always trying to replace them.
Keenum is a book marker for the Rams (obviously). He won't be with them next year.
But I'm rooting for the guy, and if he keeps going this way,and the Rams keep managing to eek out wins, Keenum will remain the starter.