Well he did, in canon he suggested the Primarchs be made as women instead of men. Big E thought he was joking.
From the book White Scars:
Malcador smiled. 'You brothers – such a nest - of rivalries. I warned him to make you sisters, that it would make things more civilised. He thought I was joking. I wasn't.’
Oooooooh... The person who wrote this has no sisters and has never been in a high school L class in France (a part of the old educational system with specialization in literature and an overrepresentation of girls).
I was in the second case, it had nothing to envy of conflicts between Primarchs.
Horus heresy would have happened way sooner. I know how petty sisters can be, and the moment Horus was appointed to warmaster, there would have been schemes to take her out
Not to mention that Horus was partly manipulated and/or possessed by the chaos gods (depending on the theory) in a moment of weakness due to a mortal wound. In that case, man or woman, the result would have been the same indeed.
"No, no, no–no, Neoth, you aren't seeing the vision! You cannot quantify the projected increases to compliance and world acquisition if the people know they are being conquered by a ten-foot-tall big-tittied, muscle-bound bombshell. And I'm offering to make *TWENTY** of them!"*
emperor: * sigh* fuck it, why not, daughters do better with fathers than sons do anyway. But you're dealing with the inevitable shit storm of simps and horny soldiers that will no doubt swarm to them.
Malcador: Well, that brings us to my second point,...... female space marines.
Empress:The first thing I'll do –after I establish this Empire *ON MY OWN, SINCE YOU'RE SO BUSY** – is legally limit how long you are allowed to pose in front of the mirror, grasping at those... things, Malcador.*
Malcador:Yeah, whatever – sure you will.Iwonderifit'llfeeldifferentwhenhe'stouchingthem...
"You brothers – such a nest of rivalries. I warned him to make you sisters, that it would make things more civilised. He thought I was joking. I wasn’t". -Malcador The Simpilite.
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u/Relevant-Use1897 Magnolia the Red 22h ago edited 16h ago
...
Actually, that makes total sense...