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Specifically I was a bit disappointed to hear that we didn't go about recruiting on Lucian crusade on our Blackstone Fortress but "a fleet of cruisers instead" which leads me to believe the Blackstone Fortress is more important as a defensive installation in the Mitu War where a Primarch still needs to be able to travel even during a conflict.
And cruisers are hardly the best we can do. They're not even battleships.
Dorn and Guilliman both had big giant fuckoff fortresses, the Phalanx and the Galatan respectively, but they also had secondary flagships for travel, the Eternal Crusader and the Macragge's Honour. I imagine on numerous occasions the Eternal Crusader might have been parked inside the Phalanx or the Macragge's Honour inside Galatan when the need arose or for repairs.
Could Talos follow a similar model? The Fortress for defense and big battle operations, a Gloriana for travel and diplomacy?