[Teresa]

Better versed users will soon give you more details, but I'll share what I prefer:
creating several realms as overarching categories so that then I can join them into one when needed.

It makes it easier to create several tiny beasts that converge to create as many huge beasts you want, then to toil in a big beast that makes you lose sight of where you are.

In my case, I use RW to organise my worldbuilding notes. And to worlbuild, too.