In Sidereal Mundane Astrology, Chapter 3 (on the mundoscope), I summarized my previous thoughts thus:
...Ecliptical aspects in the standard horoscope are unquestionably valid and are a confirmable foundation of most approaches to astrology. Still, this leaves a separate question of whether mundoscope aspects (rightly called mundane aspects) are also valid. If they are, it complicates astrology further, though that is insufficient cause to neglect them if they appear to be of value.
In most scenarios, it seems that mundane aspects are not valid to the same level as ecliptical aspects. If I had to pick one or the other, I would pick ecliptical aspects. However, in certain scenarios, mundane aspects are enormously important.
...Occasionally one sees an aspect [mundane] that makes one’s heart skip a beat but, overall, introducing an additional set of aspects is not supportable when looking at real lives.
One scenario where it is difficult for me to dismiss mundane aspects, though, is in relocation astrology. In comparing the mundoscope of one’s natal chart to the mundoscope of its relocation to a new geographic region, some mundoscope aspects disappear and others appear. If these aspects are close conjunctions, oppositions, or squares, it does appear quite often that the change in aspects matches a change in circumstances. (These are mundane aspects, after all – a framework relative to our situation in the world.) This suggests that the aspects are, indeed, valid, though perhaps more subtly than ecliptical aspects, so that they usually do not shine as clearly in the character until something (like a cross-country move) forces a contrast.
Mundane aspects, existing only for one (large or small) region of Earth, are inherently aspects of localization. They distinguish some geographic regions from others... I am unsurprised, therefore, that mundane aspects seem exceptionally important in mundane astrology charts like Sidereal solar and lunar ingress charts. Sometimes, though, we find striking examples of their operation in a natal chart...
I then gave three examples of them seeming important, striking enough to make good examples and keep the mind open and thinking processes going, concluding:
So I kept the question open and on the back-burner until I had more opportunity - and found the angle - to dig more deeply into it.Examples such as these make it hard to dismiss entirely the value of mundane aspects in natal astrology, other than as a tactic of simplification or setting priorities.