Because you are not quite right: the Smaw can be only up to 500 meters zeron and Maaws up to 900 meters but both can destroy targets over 1000-1600 meters. With the Maaws it is easier to destroy targets over 500 meters. After 900 meters you should rather use the Smaw because the Spotting Rounds are very helpful at that point. I have personally have spent many hours with the Maaws in Exile and I find it defensive better than the Smaw and it is easier to hit Targets with the Maaws Sight even when they are moving and you can better adjust the range . But thats just my persenal thought.