I honestly don't understand this statement. Notorious??
Dak and Elliott tore up the NFL as rookies. Awuzie started as a rookie. Anthony Brown is a 6th round pick that has lasted a long time. Williams started immediately at Left Guard as a rookie. Vander Esch was impressive as a rookie. Malik Collins started as a rookie. Byron Jones, Anthony Hitchens, Trevon Diggs, Micah Parsons, Tyler Smith, Travis Frederick, Demarcus Lawrence, CeeDee Lamb, Michael Gallup, Tyler Biadasz, etc. The Cowboys developed undrafted players like Steele. This year alone, you have rookies Tyler Smith, Sam Williams, Jake Ferguson, DeRon Bland, Damone Clark, and even unddrafted players like Malik Davis and Peyton Hendershot. What about developing Tony Pollard and Dalton Schultz into players worth of franchise tags?
I simply don't understand how anyone can honestly look at all the players the Cowboys have been successful in developing, and complain about the Cowboys being "notorious" for slow-walking the development of young players. Quite the opposite, the Cowboys have a reputation for developing even undrafted players into significant players, like Miles Austin, Tony Romo, La'el Collins, Terrence Steele. Mid-round players like Hitchens, Barber, Prescott, Schultz, Brown, etc. have been staples in the roster. The Cowboys have developed a plethora of young players into NFL stars, with more Cowboys rookies developing into Pro-Bowl type players than any other team over the past two decades. The issue hasn't been developing players; it has been poor coaching from Dave Campo, Wade Phillips and Jason Garrett.
The notion that the Cowboys don't develop young players is a flat out lie. It's just not true. Only someone who zeroes in on the few guys who fail, and ignores all the successes can be myopic enough to make that statement.