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It would be one thing to fight a company or even a platoon of Techmarines, each armed with the deadliest of guns, the finest of self artificed armors, and augmented to be 90% machine.
It's another if you give each one of those techmarines a contingent of combat servitors, whom are sophisticated enough to be useful tools rather than a hindrance.
And then, what if you could make those combat servitors stronger than baseline humans by replacing them with Ogryns.
The amount of force amplification we could theoretically provide to our legion with the amount of resources Lucius is producing is staggering, where the Astartes is not simply our sole primary force but a component and a leader of a diverse and expansive army. It's just turning all this raw material Lucius is making into a refined product, that's the tricky part.
IIRC Emperor actually does this with his Custodes, where some of them are tasked to act as generals who are given command of a sector and an army of Solar Auxilia to defend that front. I'll try to find the specific line.