Like the thread title asks: what is the point of GM's notes?
GM's notes can be pretty varied in their content - descriptions of imaginary places; mechanical labels and categories applied to imaginary people or imaginary phenomena; descriptions or lists of imaginary events, some of which are imagined to have already happened relative to the fiction of play and some of which are imagined as yet to happen relative that fiction.
So there may be more than one answer to this question.
Also, it's obvious that GM's notes are not essential to play a RPG. So any answer has to be more precise than just to facilitate RPG play.
(This thread was provoked by some of what I read here: D&D 5E - Do You Prefer Sandbox or Party Level Areas In Your Game World?. But I thought a new thread seemed warranted.)
GM's notes can be pretty varied in their content - descriptions of imaginary places; mechanical labels and categories applied to imaginary people or imaginary phenomena; descriptions or lists of imaginary events, some of which are imagined to have already happened relative to the fiction of play and some of which are imagined as yet to happen relative that fiction.
So there may be more than one answer to this question.
Also, it's obvious that GM's notes are not essential to play a RPG. So any answer has to be more precise than just to facilitate RPG play.
(This thread was provoked by some of what I read here: D&D 5E - Do You Prefer Sandbox or Party Level Areas In Your Game World?. But I thought a new thread seemed warranted.)