Lord Mhoram
Hero
I dont fully understand this post, The reason for having different rules for each side of the game is because they are being played by completely different types of players.
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The only difference is that they are not created like normal characters are in order to provide a level of challenge for the PCs of the game. Its not that NPCs are playing by a vast set of rules differently, but rather the math of the game says: "Hey This is the math model for creatures to be put against the party. Dont worry about choosing 50 spells, or trying to make a monstrous multiclassing behemoth in order to keep your players happy. just use this math to make a balanced creature and make it cool."
Three things about me and my approach to help out then ( and all that follows if specifically for my views and approach).

1) - Chargen is as important to me (or more so) than play at the table - so the chargen rules matter very much to me.
2) - I'm very much a "rules are the physics of the system" - the rules are the laws of gravity, the physics, the chemistry to describe the underlying structure of the game world. Having different two different types of base chemistry (Chargen) to create characters just makes me twitch. The way I look at it - if all else is exactly the same as described in the world (race, class, what the character can do. etc) - but they are built differently depending on whether they are DM or player used then the whole "rules as physics" breaks down. The rules are there to give me a mechanical foundation to create the world - so change rules depending on role (Player/GM) destroys that foundation. If something uses a different rule system, then by definition (of how I approach play) they are different in the world. And if an NPC 5th level human fighter is built different as a PC 5th level human fighter, then in world, they are different - and at that point the ability to interact meaningfully with the fiction of the world breaks down, and it becomes nothing more than a board game for me.
3) - I play a lot of Hero.
