It would be great, Ruka and Inconjunct, if you could start a thread on Uranian astrology. I don't know how to work with it, although the Astrodienst free charts pp. at www.astro.com allow you to input its hypothetical planets.
Actually, though, 3 of the angles have some reality. From an earth-centered perspective the ASC is the eastern horizon. If you are born at sunrise, your sun will conjunct it. The DC is the western horizon. If you are born at sunset, your sun will conjunct it. The MC is at the zenith--the highest point overhead. The IC is a little hypothetical because it is under the earth, but it is not hard to imagine it as the opposite of the MC.
We might add to your imaginary points list the Arabic parts, the vertex, and Black Moon Lilith. Then in harmonic charts, the planets' locations are also artificial.
Actually, you misunderstood me.
The arguments I got about not using the transneptunians were specifically, that they aren't actual physical bodies in space, that they aren't planets. Which, is true. But neither are the angles, the vertex, BML.... when I pointed that out, all I got was a lot of shucking and jiving in response, which I found interesting.