I believe since Dak relied on him, much like Romo and Witten, Aikman and Novacek, your idea of who he is may be skewed.
Not to mention he is becoming that same player for C.J. Stroud. Is he Gronk? No. But to suggest he can't catch ignores his contributions on two different teams.
And he was not as bad at blocking as everyone made out. He got beat, but then Witten got beat a great deal in his first few years. And Witten was a penalty machine, moving before the ball was snapped toward the end.
I'm not saying he is Witten. TE's generally are the check down receiver on most teams. So their numbers are not like Wide receivers. But your assessment of Schultz is incorrect.