By the time you've been a trial advocate for a few centuries or millenia, you start to know at least some of your colleagues from other afterlives. Advocates specialize. In the afterlife, there's no interdiction against learning about other worlds, but it's more efficient for some advocates to focus on Golarion (or Kasath, or Carcosa) than for everyone to learn about every world at once, and that means that eventually, you start to run into the same advocates again and again.

Bellina has a friend who's an angel. They don't talk often, sometimes not for decades, but that sort of thing means less when you're an outsider.