The problem with changing power structures as well rooted as the IoM's and Eldar's are is that they tend to implode rather than change.

That is clearly something you don't want to do while Chaos is sniffing around.

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I was more looking for strategic changes than social ones. IoM fleets can operate further and longer away from support, mobile maintenance bases for long term deployment becomes possible and generally logistics gets a bit simpler. Would that make the IoM any more aggressive than they already are?

Only after that, it starts to spill over into new applications like fusion-powered vertical farms on Hive worlds.