Whether informational, evaluative or both, interviews take up valuable resources in the Office of Admissions and by drawing on alumni time. Thus, I suspect that applicants with no chance of admission aren’t offered interviews by Emory.
That being said, I’ve heard that some schools like Princeton strive to interview all applicants.
The data released in the ongoing Harvard admissions litigation shows that alumni interview reports are given weight at least by Harvard.
https://www.chronicle.com/article/3-Takeaways-From-Harvard-s/244853