It's not about not trying, but ignoring the picture on the ground is to do a disservice to the youth. I'd argue it's irresponsble to tell anyone that they can be anything they want to be if they work hard enough without telling them to have a plan B or see if their circumstances will permit. Very few people have the aptitude to become a surgeon, the genes to become a professional ball player, etc..
Not to mention the support system and resources to accomplish those goals. Lets not forget the financial strain involved either considering people are hoping and praying Biden comes through on student loan forgiveness. Seen a headline today with a woman who racked up 540k in student debt. Imagine that same commercial saying to a kid, "Son, if you work hard enough, you too can rack up 540k in debt. The sky is the limit."