What I'm really saying is, that both Zodiacs have information to impart, including information about the Ages, but from a different angle of view.
Trying to understand how the Ages have affected the historical record requires both types of Ages.
Have you considered philosophically thinking of the Osirus-ruled Egyptian contributions as representative of an Age of Scorpio, followed by the Jupiter-ruled Greco-Roman culture as representative of an Age of Sagittarius, followed by the Western European developments from the Fall of the Roman Empire up to the present as representative of an Age of Capricorn?
If so, what would be your main objections?
Here's the timing for the tropical Ages with no guesswork, just astronomy to guide us relative to recorded history:
Age of Libra, c. 4850-3100 B.C.E. (city-states, writing, artistic monument building)
Age of Scorpio c.3100-1350 B.C.E. (mortuary culture, life after death)
Age of Sagittarius c. 1350 B.C.E.-400 A.D. (encompasses the Hellenistic Era perfectly)
Age of Capricorn c. 400-2150 A.D. (banking system, accurate timekeeping, modern science, Industrial Revolution, Capitalism)
The Ages lengths are different, with the tropical Ages about 400 years shorter than the equal-Sign sidereal Ages: ~1750 years for the tropical versus ~2150 for the sidereal.
The Tigris-Euphrates innovations occurred during an overlap of the tropical Age of Libra and the first half of the sidereal Age of Taurus.
The Egyptian culture developed during an overlapping combination of the second
half of the sidereal Age of Taurus and the tropical Age of Scorpio, resulting in the Great Pyramid, for example, which combined Earth-sign materialism with Water-sign emotional spirituality.
By the time the tropical Age of Sagittarius began, the sidereal Age of Aries was well under way, A combination of 2 Fires sign Ages.
But, the overlap of the sidereal Age of Pisces and the tropical Age of Capricorn is nearly perfect. In fact, the timeframe of the tropical Age of Capricorn is entirely contained within the timeframe of the sidereal Age of Pisces, which causes a sort of "masking effect" regarding the tropical Age.
And, as in the case of the ancient Egyptian civilization, it's an Earth/Water combination--materialism mixed with emotional spirituality.
The most important masking effect is that both Age-systems have an Age of Aquarius beginning next. Easy to mistake the more incipient tropical Aquarian Age for the sidereal Aquarian Age which begins about a couple of centuries later.