Alright, here’s my take on this:
Being overly masculine or overly feminine is idiotic. As you are all familiar with Hermeticism, everything has its masculine feminine aspects. Now, I know that in the Kybalion masculine and feminine mean different things, but it can also apply to human beings, in its more commonly understood sense.
To deny and shut out an aspect of yourself means only that you’re restricting your power.
Take for instance the overly masculine macho man, he might chest pound and brag how he’s “le alpha male,” but he lacks cunning - he won’t pretend to be submissive in a particular situation which would in the long run benefit him. Deception is a game. And because the “le alpha male” must always be the leader, in charge, or whatever, he will lack adequate game pieces in order to achieve maximum benefit from certain situations.
There is only one example, there are plenty. Frankly, I can’t be arsed listing every example.
Now, on the other hand, if one is overly feminine (or significantly more feminine than masculine), they most likely won’t have the balls to stand up to someone, to fight for their own right, to set up boundaries, and so on.
You gotta find a healthy balance between both the masculine and the feminine. Not be a doormat, or a blithering buffoon.
tl;dr: Neither the overly masculine, nor the overly feminine person will get maximum benefit from various situation they end up in. You have to utilize both masculine and feminine aspects to truly be a…king.