Originally Posted by
Surfd
probably because the laws of magic wouldnt let them. The 40 yard / etc / etc restrictions exist not only for game mechanics balance purposes, but probably also because doing something like attempting to lob a fireball a mile away, or summon a blizzard over the horizon would probably cause their heads to explode, or magically fry them to a crisp for trying to channel that much power. Wouldnt make much sense otherwise, because if spellcasters were effectively limitless, every other profession out there would be effectively redundant. Why even have seige engines if your warlocks could just stand on a tower ten miles off and rain fire down on orgrimmar all day long? Why have archers if a mage with a telescope can kill you with 100% unavoidable magic missiles?
Hell, if "game mechanics" no longer apply, then nearly all magic spells would likely become dumb-fire, instead of the homing stuff we have in game today, since pretty much the only reason that all spells track their target is because the game was designed that way to facilitate gameplay in an environment where mele classes have good mobility.
Just because you can toss a fireball 40 yards, does not mean tossing one 4000 yards is going to be just as easy.
But then, that gets into rediculous meta discussions, like for example, why was there never an instance where a single level 50 spider from the old Western Plaguelands ever wandered into level 4-6 Tirisfal glades and absolutely destroyed everything in its path? I mean, you have swarms of monsters just on the other side of an imaginary line that could oneshot literally anything the zone next door could throw at it, and nobody bats an eye at this? Last time I checked, the jungle cats in North Africa were not 60x more deadly then the ones in South Africa just because they are on different sides of a few border lines.