That's mainly because people are often overly "idealistic" in their definitions. (There's a reason my original suggestion included "throw out the BoED".)
I don't think it's that hard to define, at least in the "I know it when I see it" sense. Good people try to help others, evil people will seriously harm others if it suits their purposes, neutral people tend to avoid harm but don't help much. Lawful people follow a strict code of behavior (whether their own or an independent authority's), Neutral people follow a loose code of behavior, and Chaotic people take each situation on its own merits.I still think that wedding a poorly-defined moral system to the rules is foolish
Definitely.but you might be better served by better adjusting your neutrality expectations than trying to say that only certain people, who happen to have a class that runs off a certain stat, can ignore certain inconveniences while everyone is stuck with them.
True.Plus, again, alignment-based outsiders. A solar certainly has the stats to ignore alignment. For a being of pure Good to become a blackguard seems like it would smash the intent of your rules, even though it's a perfect expression of the mechanics. Alignment-based outsiders tend to be high-level foes, with correspondingly high stats to match.