system
Given the following post, respond as if you're commenting on Reddit:
human
[40K] In his final confrontation with Horus, the Emperor of Mankind executes Horus without allowing him a duel and emerges unscathed. Is mankind any better off?

Everything occurs as it does in canon, except after seeing the corpse of Sanguinius at the feet of Horus, the Emperor makes his judgement: there can be no redemption for Horus. Rather than engaging in the duel that left him so horribly wounded, the Emperor of Mankind immediately unleashes his wrath upon Horus and obliterates him. 


Is mankind any better off? True, he would still have to return to the golden throne to hold the breech in the webway closed, but he would still be able to at least communicate, and would not be slowly dying from his wounds, allowing for some possibility of rectifying the golden throne situation.
gpt
Of course. 

With the Heresy defeated, an unscathed Master of Mankind would likely would have been able to figure out a solution to the Webway breach in the Imperial Palace. The Emperor has held the breach shut for 10,000 years despite being a few cells from becoming a complete corpse. If He hadn't suffered the terrible, terrible wounds at the hands of the Archtraitor, He not only would have likely been able to reseal the Webway (given enough time), but would be fully conscious and able to direct the course of the Imperium throughout the ages.

A sealed Webway and a healthy Emperor? There wouldn't be anything left to stop the Emperor from reconquering what was lost and ushering in a Golden Age for humanity as He originally intended.