Heh... well, my comment on that would be that once the first wizard discovered how to create a Fireball using magic... there would have been a technological arms race to see which nation's military could put it out on the battlefield ASAP. And then once they did that... nations would have paid wizards back home more and more gold to extend the range of Fireball past 150 feet. Likewise... other nations would also have paid wizards to find ways to create counterspell magic defense out to 150 feet, and then beyond. None of this "3rd level spell to 90' and then stop working on it" BS. 
Then once the range of Fireballs were lengthened, and the range of counterspells were too... then wizards would have worked on Fireballs that were NOT counterable... wherein other nations would have paid for the R&D to create shielding from any types of Fireballs etc. etc. etc.
D&D magic does not adequately represent the technological (magical) arms race that would have occurred once most of these magical spells were discovered.

Then once the range of Fireballs were lengthened, and the range of counterspells were too... then wizards would have worked on Fireballs that were NOT counterable... wherein other nations would have paid for the R&D to create shielding from any types of Fireballs etc. etc. etc.
D&D magic does not adequately represent the technological (magical) arms race that would have occurred once most of these magical spells were discovered.