The Bolsheviks relied on existing structures, functionaries and specialists because they HAD to. Nothing else was possible, they existed in the real world in the midst of a civil war, not some childish fantasy.

Trotsky aggressively recruited Tsarist military officers, many of which served without really aligning with Bolshevism.

And just a few other facts to add: world war, civil war, famine, coercion, mass violence, dependemce on inherited infrastructure and harsh repression. That's what you want for the US? Because real people, the ones not playing make believe on the internet, do not.