It highlights the ongoing debate between local vs. national, as well as the debate about radio being more than a music distribution service. Certainly having the morning producer do VT retains localism. But Delilah does a very different thing, weaving callers and stories with selected songs into a cohesive show built around a theme. This is way beyond local VT or another 10 in a row. Some people (obviously not all) want radio to be more of a companion. To speak with the audience on a one-to-one basis. She has the experience and the relationship with the audience that is hard to duplicate. And sure, it's not for everyone. But it's already proven itself in Philadelphia. She's a known commodity that has an audience, and they identify with her point of view.
