It might be OK because this desert map is not as object heavy like for example sldg.map and similar which is smaller map but it has large city and villages and trees (I think mob spawns come into load only when used in the client). Those maps might be OK in your editor or zircon client but Crystal editor (at least the one I use) is not x64 program and it struggles with those maps, can run out of memory when you edit large maps and need to restart editor... also not easy to make minimap due to memory thing.
Maybe others will have something to say, I don't quite recall the various objections back when Chalace was making huge maps and when I made Crystal editor able to make new maps up to 4000x4000 tiles. It was OK when the map was empty but if it was filled up with tiles (I didn't try), the editor might not even open it, again memory limitation.
Other objections might be that you could burn out populating such huge maps
Also from the player point of view, not sure if it maters that you can keep going and still be on the same map without reload, if that enhances your game experience.
Otherwise I am like you, also like huge maps, that's why I made the editor able to make new maps 4k square. Maybe if it was mostly filled with water and those non-walkable backlands and there would be islands on it...