Interesting, IME it's all beans. At my go-to place, the baristas are pretty bad but the two owners are super dedicated to roasting their own beans, you can always see them putting a lot of time and effort into it. Result is much better than places where the baristas are skilled but they use cheap pre-roasted bulk beans.

To take it to an extreme, I doubt the best barista in the world is going to get a good shot out of the default Starbucks beans. But maybe I'm wrong!