in that receivers are being schemed open, but the players aren't making the plays. A good offense has to have both, those being the scheme setting players up for success, and the players that are capable of executing. Our players are just not getting it done.
Put the kid in at QB, simplify the scheme as much as you need to for the gameplan to be something he can handle. Spread the defense out, hammer the ball in the run game, and let Goff take shots downfield off of play action. IMO there is a chance his throwing talent can make up for inexperience if they are careful not to put too much on him.