I think it may be an idea for moderns to keep the traditional rulers as co rulers, at least. Many still do.
The big issue I have with the modern replacements is that in traditional astrology Mars is actually at his strongest in scorpio. Where he's both a domicile ruler +5 and a tripliciity ruler +3, plus mars is in sect by sign ie he's nocturnal.
(I would refer you to the moderator's comments re: traditional versus modern, made on post #15.)
Without going into the merits that 'traditional 'astrology applies to sign rulerships, I was astrologically brought up with the 'modern' working thought that Mars was more related to Scorpio during youth - pre maturity when it's all about the power force of ego and hormones. Pluto took over rulership once the force and power of depth of emotions became more
significant.
I believe there to be a lot of truth in the difference. When is Mars ever able
to consider the importance of others and how they work before and beyond its own?
But nowadays Mars only belongs to Aries to some moderns, which is actually his worst placement among the 3 signs he has major dignity in. In Aries mars is too reckless, not adaptable, and runs out of steam too quick, whereas in Scorpio he is calculating, subtle and has nearly endless
stamina
Not thinking in terms of traditional rulerships, 'too reckless and not adaptable' would seem to apply more to Sagittarius. Mars of Aries does not run out of steam. It creates the fire that energises spirit, yet lacks the patience to carry on regardless. It's in Scorpio that its fire is doused with
water. What does fire and water create? S-t-e-a-m!
Even Capricorn Mars tens to function better than Aries mars.
It doesn't function better; it functions differently. Mars in Aries is the planner with the ideas; Mars in Capricorn is the constructor with the bricks and mortar.
Saturn is another one who's better side has been overlooked lately. Saturn is overly cold and dry, so just assigning it to Capricorn only shows the planet's worst side among it's 3 majorly dignified placements. Traditionalists believe generally that Saturn functions better in air signs Libra and Aquarius due to the hot and moist element of air balancing Saturns extreme dryness and cold. Saturn was said to rejoice in Aquarius in traditional astrology, not Capricorn.
I'm glad you confirmed that it is a belief and not a rule.
By balancing a malefics extreme nature, ..................
Which is not a term(no pun intended) used in 'modern' astrology application.
In order to understand these planets it's a good idea to keep those traditional rulerships and not disregard them.
I admit that, personally, I consider traditional rulerships more than I used to, yet this is in relationship to the importance and strength of Sun and Moon aspects in a chart.