It struck me while playing a game last night that it seems odd that pre-measuring is not allowed in 40k but is in Fantasy. I'm sure I am not the first person to notice this...but fluffwise it does not make a lot of sense.
Drooling Idiot Centigor: "How far away would you say that Dwarf cannon is?"
Cow-Brained Minotaur: "Easy. 23.4 meters"
Futuristic Predator Gunner Looking Through Laser-Range Finder: "Yo! Anyone got a guess on the range to to that Carnifex?"
Super High-Tech Techmarine: "Frak if I know. Let's go with...too close!"