"Two busts (at any level) is going to delay your career progression. But it's not a show stopper."

Rickair7777 check ride failures especially at the primary level aren't deal breakers to legacy carriers. I know of multiple pilots from regional carriers who have 4+ check ride failures who were hired at legacy carriers. And I'm talking 10+.
Its absolutely about how you own it and less so about being that perfect pilot IMHO