I've previously asked for this same thing (and not just the Bozjan/Eureka equivalents, where we're sequestered in a single zone).

Two things about FATE mobs that were great: 1) they made any zone they were active in feel alive - way, WAY more alive than any experience I've ever had with areas in, say, World of Warcraft. When you were running all over the place in the South Shroud, or Southern Thalanaan, or whatever, it really felt immersive.

And 2) it was an amazing way to meet people and just talk. I loved that about FATE grinding. It was lovely to just interact with people who you wouldn't normally bump into, and have conversations about whatever. I barely talk to anyone anymore, outside RP.