You can't even make a logical argument.
Robinsons knowledge compared to a fans in not the issue.
It's Robinson's knowledge compared to real NFL coaches that is relevant.
You are claiming the coaches are don't know what they're doing.
Even if the coaches were complete Morons, Romo would have forced the issue if thought Dez could run all the routes.
Running the route tree is about study and practice. Dez didn't want to study/practice details in the past.
Maybe Robinson and the criticism along with the fact the Cowboys have considered cutting him might get him to study/practice route running; however, if he does do it now, that means he wasted years just half-arsing it.