I'd like to introduce you to a term, it's "artistic license".One of the funny (and often irritating) is that fantasy maps ignore something called plate tectonics. While Blizzard blew any idea of basic climate out the window by having areas like Dun Morogh right next to Searing Gorge, Loch Modan, and Wetlands, they still ignore plate tectonics. We know the continents were once all one giant "Pangaea" but one of two things had to of happened to explain the continents splitting. Either:
1.) The water level rose and what we see now are effectively mountain tops.
2.) The plates under the continents drew apart (much like Earth).
Since Azeroth is now known to be a sleeping titan, unless the planet itself is an egg and the titan is within, plate tectonics don't work. Only way for plate tectonics to work in the case of the planet being an egg would be if the egg were cracking and thus hatching. Since it seems that's not the case, that means the water level rose instead. For Blizzard to bring back in new areas, the water level would have to effectively drop which would additionally mean areas like Kalimdor, Eastern Kingdoms, Northrend, and Pandaria would be made larger. That would also mean an area like Vashj'ir might effectively be gone due to now being above water. Blizzard's not going to do that since it'd be too much work.
Going off the map in the chronicle book with the assumption of the water levels having risen potentially removes a good many areas where something could have been. That's not to say there aren't other areas we have yet to see. Kul Tiras is out there after all. But the map really shouldn't be cluttered because that would suggest then that the Azeroth "Pangaea" was just one giant mountain. It would effectively be a pimple on the back of the titan (or its egg).
Technically, with either explanation, land will be lost. You can't break apart something and not lose something along the edge. You have to cut it to avoid losing anything and even then you can still lose something. Plate tectonics isn't a knife. It breaks things. So even if the water levels don't explain the continents moving apart, plate tectonics would which would ultimately result in many areas being lost to the ocean. But the funny thing is, if you line the Chronicle map up with the current Azeroth one, it only suggests Blizzard really knows nothing about basic planet structure. The various areas line up almost perfectly. So that again only suggests the water level just rose.
So neither way for how the land masses work in Azeroth are possible. Blizzard shot themselves in the foot. The simpler way to explain the land masses (plate tectonics) is often outright ignored and Blizzard screwed up by saying Azeroth is a sleeping titan anyway which removes this possibility. Then the other way to explain it is just too time consuming to implement.
And that's just outright ignoring how the hell an area covered in snow can be right next to a barren wasteland which is likely hot given the wild life that lives there.
Blizzard should have hired geographers when building WoW originally or at the very least focused on the map as a whole. Having each continent or even sub area of a continent with their own climate system makes things severely disconnected.
Then again, Blizzard's not against just adding things. Gilneas wasn't really visible from Hillsbrad before Cataclysm. Timeless nor Isle of Giants were visible in Pandaria before they got added. Uldum wasn't visible from Tanaris. Twilight Highlands wasn't visible from Wetlands.
Bit of a rant, I suppose, but I'd rather Azeroth not be cluttered. That just makes the evolution of the planet boring for those of us that actually enjoy things like that. It shows the developers look at even small things. But hey, Blizzard's really into doing stupid crap lately so why not just bring back everything and give us the Azeroth Pangaea? Make it one big continent.
Hire geologists to design a video game. That has dragons, elves, and magic in it. Riiiiight.
Also, the maps for the game are not intended to be accurate, nor a tool to actually navigate. They're art for a mythical world, and are often exaggerated or condensed for design purposes - a full screen map with teeny tiny landmasses with no room for titles and landmarks doesn't really work very well to communicate information to players.