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It's just simplier to prohibit all modding right away. The line between a mod and a cheat is rather blurry, so allowing modding game files would lead to VAC banning most modders and a lot of crying of being "banned for no reason" on the forums. I think the main reason why mods aren't allowed is VAC it's an automated process that detects ANY big modiflications to game files, and sets an infinite ban. Not to mention full of bugs and glitches. And even the "legit" custom maps were rather amateur stuff, often either way too easy or way too difficult to play. I consider that cheating, and far from fun. Most modded lobbies from world at war were some crazy ♥♥♥♥ where you could go to a "skybase" outside the map, switch god mode on and off and get any weapon instantly.
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