Not saying it's same reason, but I remember Tony Dorsett always complaining about his lack of carries when he was the premiere rusher in league. Tom Landry had his eye on the long term.
Years later at end of his long fruitful career, Dorsett acknowledged how grateful he was to Landry's management of him and how he
achieved so much more because of it instead of being used up quickly like so many RBs.
He averaged 14.5 games per season over 12 years- a really amazing stat for a RB. and averaged about 19 touches (carries and receptions ) per game.