I remember posting a stat back in 2016 that showed Dak was the most accurate tight throw QB for the seasonThey coach that, they don't want any overthrows. Overthrows cost you the yards you could have had. Overthrows cost you that down. They want the QB to underthrow the wide open man, make the receiver come back for the ball then "make a play" with YAC. It's much preferred to the ugly overthrow. It's pretty much universal.
That all said, cmd's observations were NOT true of Dak in 2016, and we all might remember I feared Ginger would fuck the kid up once he had a full offseason with him as the starter. It happened. Romo had all the same issues cmd saw in that feature. It's endemic to the coaching they both received. Neither guy is Aikman but I contend they both could have been, if not for the crap coaching and advice and yes, directives they received.
Watch some of his 2016 work. You will see him make each and every throw you want a pro QB to make. Everyone's forgotten that.
Like you said, he was accurate until Garrett got ahold of him.
Hopefully MM can unfuck everything the Garrett did to him