Just starting this so as to avoid clutter in the Errata/FAQ thread.
When it comes to zone based games I found the players who had the hardest time adapting is those who try to conflate zones (which is a narrative based system) with range (which is a tactical based system). Doing so invariably leads to trouble as people ask “last game I ran across an entire open field and this game it takes just an action to move upstairs”. Zones are deliberately nebulous and narrative focused. Each GM can do things differently. While I may say that a raider hideout has each room as a zone to create a more claustrophobic environment with more movement necessary another GM may say that the outside is a zone and then each floor of the hideout is a zone, creating a more open environment allowing for faster movement and target acquisition.