In 40K and other games, longer ranges make more sense. Back in WW2, people often just shot to keep the other guy down until they got close enough to capture/kill them. Think of the mechanics in the game to basically reflect that concept, imo.
I think the rules are damn good and the shorter ranges are suitable and give the game a good variation without making it a shooting gallery.
Shooting doesnt have to guarantee kill effectiveness at longer ranges, there could be penalties in place that lessens the chance of the game being a shooting gallery … But if i want to take the chance, id like to be able to do that and still be in cover, instead of having to run up and press a gun barrel up someones nose. Sure, quick and effective rules work well for game flow, but sometimes a game can be made really interesting with mechanics nodding towards some realism. Why are reactions only allowed at 12" for example? all of a sudden my already gimped weapon can only fire 12" instead of 16", for no reason even attempted to be explained in the rule book.
Balance and fun is great, but sometimes this game just feels too much like only a "game" , imo there should be a nice balance between logical mechanics, balance and fun. I would like to be able to play the game in all possible ww2 scenarios if i want to. I think there is much more potential in these rules, if not in the rules then for the Dust setting and characters … it just deserves more than what it got, imo.