Let's say a player averages 5° off-line.
A shorter hitter will be "more accurate" because his ball won't go as far off-line, but stats show that the longer hitter STILL has the advantage. In fact, Broadie's stats would say that gaining only 20 yards while keeping the same accuracy level (by degrees, not by fairways hit) shaves 2.3 strokes off the scores of a 100-shooting golfer.
That same golfer will only shave 1 stroke by hitting the ball one degree more accurately.
Table (Click to show)
Note how at every level of the game, the added 20 yards of distance is equally or more important than an extra degree of accuracy.
I am usually around 85-90 strokes and I would say 20yds would improve me by about 5-6 shots a round, y20 yds is a big difference, I would love to turn my 5i approaches to 7i!