What If the Horus Heresy Never Happened?

This text explores an alternate history of the Warhammer 40,000 universe, envisioning a scenario where the Horus Heresy never occurred. It delves into the implications of the Emperor of Mankind’s uninterrupted reign, the unity of the Primarchs and their legions, and the absence of catastrophic betrayal. The analysis considers the potential for humanity to thrive under a secular, scientifically advanced Imperium, achieving milestones such as the completion of the Webway Project and resisting Chaos. However, the narrative also acknowledges the persistent challenges of external alien threats, internal strife, and the complexities of governance in a galaxy-spanning empire. It paints a nuanced picture of a hopeful yet fraught alternate future, where humanity's resilience and the Emperor’s vision are tested against the vast uncertainties of the universe.