Helldritch
Hero
Thus, PCs are much less special from everyone else that some people would have them. Yes they use a more generous method of stat generation, but all in all that's about it for their "cut above" status; anything else comes from what they do in play.
That Sir! Summerize my whole approach and view on the discussion. An NPC is not a monster, it's a non player character. It should normaly follow the same rules as a PC. PCs are heroes (well... usually...) and have a small advantage in creation from the vast majority. But so are the opponent NPCs. The thing players and NPCs have in common are the rules. Bringing monsters as an example for special powers unavailable to players is kinda of missing the point. And by monsters, you can put the gods in there too. But it was possible to play gods and they had their rules too! It was called the Immortal Set for ODD.
We played it back then and it was fun for a few sessions. It showed us that even gods had some rules in their behavior and capacity to do things. If even the non players god/immortals and the players playing gods/immortals had to follow some rules, so should their mortal equivalent the NPCs and PCs.
There is a synergy in the rules. Most if not all rules are shared by the PCs, NPCs and Monsters. Be it concentration, saves, skills, movements or whatever else, the vast majority will follow the rules. Once in a while, you will see an exception. But it will be an exception nonetheless and not the normality. And putting an exceptional power on an NPC and making it unavailable to the PC is something that should not be done often. Any players worth their salt will ask questions. And the higher in level, the clearer the question will be. If the power is so game defining, you can bet that the players will try to duplicate it for themselves unless the drawback is too costly.