1) That doesn't address simple problems like Save or Die/Save or Suck. If your response to "He casts Hold Person" is "Well an enemy mage can cast that too", well great. But that means that it's mage on mage, and party fighter is left out. Or rather, he just winds up getting hit with various Save or Die effects while trying to stab the enemy wizard/deal with summoned monsters.As far as magical disparity. All the big nasty spells and neat tricks the players have the enemies also have. They exist in world where big scary magic is present and the bad guys know it is present and worse have access to it.
2) Do you see exactly how much effort you have to put into countering spellcasting? You need an intelligent organization who has far reaching capabilities, the capacity to watch the PCs and instigate plans just to address one or two classes? All the time. Not every foe the PCs will face will be uber-intelligent and prepared.
Furthermore, super-smart/capable enemy completely neglects situations where it doesn't work. Ok, the PCs bust into a crypt filled with undead and other monsters, and they bring the big nasty spells. So, what do the enemies do? Their reach doesn't extend further past the dungeon. Or take "Against the Giants" as an example. It's a long string of big brutes. How exactly do they deal with high powered spells - send giants out to watch the PCs and then hire wizards to deal with them?
If I have a choice been "10x the work just to counter the capabilities of high level casters" and "A system that's balanced so that I don't have to deal with that crap", I'm going to go with the latter and not sweat it.
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