It’s so hard to tell - maybe not possible for an evaluator - at which point a quarterback has bailed on the pocket because he really needed to and when he didn’t need to.
I’m a big believer that pro football requires a quarterback, to be most successful, to have a full view of the field and be able to throw anywhere. Hence, running in one direction limits vision and options. I’m addition, five linemen are the only immobile positions that can’t be changed and must stay relatively stationary in place. Those linemen are facing forward towards incoming defenders, so they’re not made to change blocking directions when the quarterback suddenly leaves the pocket and improvs.
It takes an astonishing amount of athleticism and skill for scrambling quarterbacks to equal, by improv and juking, what the best pocket quarterbacks can do without that stuff. Example: Rodgers has that extra dimension, but advanced stats show due to sacks and lesser YPA on runs than passes, in the end he’s still behind Brady, Manning, Brees, and offensive ppg confirms this too.
So it’s possible - sure - for a dual threat or a scrambler to do well, it’s just such much more rare. We have the elusive guys like Young and Elway, the backfield dodgers like Staubach and Tarkenton. But finding that tiny seem within the pocket, stepping up and angling your body for a throwing lane, avoiding a sack by split seconds…is at least as effective but not celebrated. None of these guys could scramble at all but could avoid sacks and get the ball out quickly: Brady, Manning, Brees, Marino, Starr, Unitas, Baugh.
So I usually ere on the side of a pocket passer like Jones who doesn’t bolt from the pocket. Like any position, there’s no universal truth. On some plays, an elusive guy may have avoided a sack, while on others, a disciplined pocket quarterback hangs in and fires a completion while a scrambler was running away from pressure, looking to fans like a hero but actually being less valuable. In the end, I think the guy who stays in the pocket has the better long-term results. It’s not to say every pocket QB is better than every scrambling QB, but again, pocket QBs are more likely to succeed.