One of the things I don't like about being put "On Hold" after auditioning for a part is because of how it feels. For those who don't know the term, this is what happens when you audition for a role in television or film and the casting team likes you, but aren't sure they're going to go with you. They're asking you to be available on their shooting schedule (for your character) in case they cast you. So, it's good news, right? Sort of.
As an actor, we want to be liked, so it's good being put on hold because it means that the director likes you.