The Cowboys like Schoonmaker. And honestly, most people inside the building really do like him. Outside the building? That's a different story.
I think the disconnect is that the fans had one expectation for Schoonmaker, while the Cowboys had another. He wasn't drafted to be a pass-catching TE first and foremost. That doesn't mean he can't catch the ball — we've seen that he can, especially when Ferguson was out. Look at what Schoonmaker did when he was actually given a larger role. But too many fans look at his career stats, see the lack of production, and immediately conclude, "HE SUCKS." That's the wrong criteria.
If you're going to judge Schoonmaker, judge him on what Dallas actually drafted him to do: block, handle multiple responsibilities, play in-line, contribute in the run game, and be a dependable all-around tight end. And he has started 13 games the last 2 years. You can argue whether he's lived up to that role. That's fair.
But judging him primarily by receiving yards and catches misses the entire point of why the Cowboys drafted him in the first place.