Is there any special function your website can do that FRED can't? I'm pretty sure all BLS data ends up in FRED.

If you’re trying to make a point about a change over a specific period, you can select a range and the selection gets appended by JS to the URL, such that if you send someone else the link they’ll see exactly the selection you made. It’s also possible to follow figures and be updated when they change. But also interesting things become possible across datasets. For instance, it becomes possible to mash up absolute job numbers from the BLS with population estimates from the Census and get accurate per-capita figures, that stay current when either the BLS or the Census publish new numbers.