It's not “this one has to solve everything” so much as "this one needs to even demonstrate an attempt at the promises given."
In 2008 Obama ran on codifying Roe v. Wade, but once he was in office? "It's not the time." The DNC has been lying to progressives since before I could vote.
Counterpoint: when my wife's ex-husband was deep in the throes of heroin addiction, he managed to rob the same bank twice and get away with it both times.
You might be right that he'd be caught eventually, but he OD'd before he could try a third time.