If a supplement (adventure, sourcebook,...) contains maps or sketches like the one of the Wheel hangar deck, the GM may or may not use it (if he finds his creativity limited or constrained for example). By not including the maps...well there is no choice!
I too really dug the maps in the beginner boxes, and I would love to have nice ones like that for the published material. Since it's been stated by FFG that cost is an issue, so I would like to throw it out there that if FFG made additional map packs, I would buy them. Looking at several comparable map sellers (whose maps are great but the flavor isn't quite there for me) and it looks like the return on such a venture could be profitable.
[edit] I would still prefer the content digitally, and heck, I would even throw some money at that.
Edited by themensch