Kate Arthur of Buzzflash digs into the backstage shenanigans that made this show such a mess and finds... Mary Sueism?
The issues occur when that person creates a show with obvious, worsening problems and won't listen to anyone else — and that is what happened with Rebeck.
But Julia faced bigger bumps than her unflattering clothing; Rebeck based the character on herself, and yet wouldn't allow Julia to have a good arc that would satisfy or endear her to the audience.
If the writers wanted to give Julia something to do that was hard and that she would eventually get through, "Theresa would say, 'It's not a struggle! She doesn't have a problem! She's the hero! She saves everything!'" said someone who witnessed this oft-repeated discussion.
There are other reasons discussed in this article and a lot of juicy gossip, but I love the subtle takedown caused by posting a version of the above photo with the final picture of the article, this one of Rebeck.
Oh. I see. I see indeed.