AbdulAlhazred
Legend
Right, I'm getting itAgreed! And I think it's a virtue of my scheme that it makes the classic drawing of A Paladin in Hell fit within the alignment system, rather than look like some sort of alignment error!
Hopefully this also makes clearer why I find the Planescape alignment set-up so irritating, because it embodies all the incoherences you diagnosed, and makes it hard if not impossible for me to articulate the scheme I find interesting.

Right, no paradox. They simply have a common view of law, at that level.I like the amusement value, but I don't think it's a paradox. The CG person asserts that social order and hierarchy are a burden on wellbeing beause of how they constrain self-realisation. (That is a paraphrase of Gygax.) The LE archevil likes social order and hierarchy because they let him/her impose his/her yoke of domination upon the world. (Again, a paraphrase of Gygax.) What do they disagree about? Not about whether or not social order and hierarchy are a source of misery! It's just that the CG person cares about that (because s/he is good), whereas the archdevil doesn't (because, being evil, s/he cares for nothing but self-interest).
Right, I understand it clearly now, thanks. The conflict really IS about good and evil, but its about how you define them through the lens of law/chaos in a sense.Absolutely agreed, but I think in a game taking this sort of focus alignment isn't really doing any work at all. Because the alignment system already comes with a prepackaged notion of the good guys (they're labelled "good") and the bad guys (they're labelled "evil"), a campaign focusing on good vs evil doesn't actually enliven or activate the alignment system at all. There is no debate about which of the elf or archdevil is morally correct, for instance - the archdevil is a monster who uses the most vile means to enslave his/her (and other) people.
What I was looking for in my OP was a way to identify an interesting moral question posed by the alignment system. And the one I identify is the question of law vs chaos as means to wellbeing.
Agreed, I think I would want some sort of way to particularise the social order vs self-realisation issue. I have some thought about how I might do that if I wanted to, based on my ideas about the way enclosure worked in England and how similar processes around agricultural production and urbanisation operate in other countries within the contemporary economy, but I think the board "no politics" rule means that I won't go any further than that in setting it out - but hopefully that gives you a sense of how I might do it.
Eh, I'm not a mod, but I think the 'no politics' rule is more about arguing ABOUT politics vs discussions of truly game-related things where some political idea might provide insight. It may still be possible to hit some nerves though as you might hit on personal experiences. Still, I'm mighty curious. I certainly know very little about the details of how 'enclosure' worked, or even perhaps what the term means exactly in a technical sense, given that I'm no sociologist/anthropologist/whatever.
So, if you get the urge to expound on it, I'm intrigued.