The O-Line has been garbage for the past 2 years.
This year it's finally looking mildly better, but the problem is that the offense is still running the "Oh fuck, we have 0.0201 seconds to pass before he's sacked, everyone run a 2-yard pattern" scheme (much like Carolina was post-SB when Henning was still the coordinator).
If you rely too much on the YAC and not enough on the "Run down the field and I'll throw it to you", then everybody just puts 8 in the box with 3 deep cover and you can't do anything with the ball. 8 in the box stuffs the run, the box is wide enough to smother a screen pass and the possibility of pressure is enough to make any QB rush the deep ball.