“Scrambling QBs do not have long NFL careers.”
You are probably too young to have heard of Fran Tarkenton.
I am 57.
I do remember the Purple People Eaters.
I also remember they went to the Super Bowl 4 times and lost. Just like the Bills.
I also recall that back when Fran was running the gridiron DB backs were big FAT guys that could not run very fast. Linebackers were on average about 230 lbs. Free and strong safeties were also quite a bit smaller.
Fran would not survive very long in todays NFL. The defensive players are way too fast and much more muscular than they were back in his day. Fran was akin to Doug Flutie.