The navigation is covert. It is looking to minimize the chances of being spotted by (presumably) looking for shadows, going under tables, avoiding people and whatnot. Mapping is not even mentioned in the system's factsheet.
Personally I doubt that someone would be actively looking for lasers or have laser detection systems installed in a combat, hostage or other similar situation. In any case vision-based mapping is also possible, so I guess they either wanted to minimize processing requirements or it was just easier and faster to get a product out. When they start selling it, it will probably come with different payloads EO/IR, laser scanner, chemical sniffers, etc.
Btw Kinect (which someone suggested as an alternative) would have the same issue.