The throw on the deep over route where he was wide open was far too high. He leaped for it and barely was able to get a hand on the ball. It would have been a remarkable catch if he brought it in. That's absolutely silly on a play where nobody was around him. Yes, Mannion had pressure bearing down on him, but Goff has stood tall a number of times this year and delivered knowing he would take a hit.
On the post route, he could make it much easier. Everett originally caught the ball, but he had to turn and reach back behind him to do so. That left him fully extended with the ball right in front of the CB's face. It was very easy for Witherspoon to punch it out. It's easy to sit here and claim he should catch that, but Everett isn't playing against air. That defender is going to do everything in his power to keep him from catching it. Everett had him beat. Had Mannion put it out in front of him, it was an easy catch.
So yes, it would be much more preferable for him to run over and hand it off instead of making an inaccurate pass that costs us the completion.