Preface: Please read this entire post before replying. My point is at the bottom of the post.
Dworkin is neither enemy nor ally to Corwin. Oberon, too, is neither enemy nor ally to Corwin. They are forces of nature, elements that RZ uses to set the stage for Corwin's story.
The Elders, as they are portrayed in ADRP, are intended as enemies and allies for the PC's... but the points that they get make them forces of nature.
Instead of living in a universe where there are two forces of nature pushing them around, the PC's live in a universe with a dozen or more. Is it any wonder that one of the first things that some Amber GM's do is kill off, incapacitate, or otherwise remove from play a significant number of the Elders? There's just too much.
Now let me get back to my original point again, since this seems to be a side track that I keep finding us going down, and it's secondary to my point.
I'm not saying that the Elders should have the same number of points as the Youngers. I'm not even saying that the Elders can't have vastly more points than the Youngers. What I am saying is that when the rulebook presents the GM with three options, those being 300, 400, and 500, it's going to take a significant leap of faith and intuition (not impossible, just not easy) to realize that it could be 200, or 150, or 100.
That point is secondary, and an example. The fact that people argue that it's right and proper that the Elders have far more points than the PC's illustrates my point! That's a bias that's based on an interpretation of the books that's valid but not the only valid interpretation.
Now on the topic of Arden, Rebma, the Golden Circle, etc., the "Three options" model is, in my opinion, no better than it is for the Elders. Instead, I'd rather see a concordance of facts that we know from the canon about these places, followed by (perhaps) a long list of questions a GM might consider for what the place is like.
So in the end, it's about preference; a matter of taste. I don't like the "three options" Elders and I wouldn't like "three options" for Arden or the Golden Circle or anything else. They're too constraining. No, they're not actually locked-in constraints, but even as suggestions they go too far. If someone wants to read what others have done with such places, there are plenty of sources on the 'net.
In summary: I don't like powerful Elders. Yes, I recognize there are good arguments for why they should be, but I don't find them compellling compared to th arguments for why they should not. For this reason, I'm wary of the meta-content that would inevitably show up in a "three options" version of, for example, Arden.
That's my opinion. As such, I'm not sure how much discussion it bears.