How Can We Worldbuild on an Epic Scale?

Here's the latest from Jami Gold, Paranormal Author :

Early last year, I explored whether we could worldbuild without a plan. At the time, my perspective was mostly focused on pantsers, those who write by the seat of their pants and don’t plot in advance.

However, no matter how we write, it’s good for us to develop this worldbuilding-on-the-fly skill, as every story requires us to build a story world (at the very least for the genre, setting, and culture: think of small-town cozy mysteries v...