Producer titles get thrown around pretty loosely in television. I worked with a group of writers, rewriting other scripts and coming up with story ideas. Sometimes a freelance writer may not capture the show the same way someone who is here every day would. That is not the writer's fault, really. You just look at the show differently when you are here every day doing it.
Story problems are always harder to rewrite than dialogue problems.
Dialogue is fairly easy to fix if your story is in good shape. I'm executive producer and have been running the show for the last three seasons. I usually come in between eight and nine in the morning. The first couple hours I'll spend doing dialogue editing or video editing. The rest of the writers arrive around ten.