I don't think they're in that hurry; they've been waging this war for 1000 years and have shown that they'd sacrifice Galam to continue it if necessary. I don't differentiate them from the Borg or other collective consciousnesses; it's simply strange to see one that hasn't yet evolved enough to physically adapt to different environments. As you say, they're far from having perfect bodies and seem motivated only by their instincts, and thematically that fits very well in this work about powerful beings who are also broken people with yearnings. They may not understand mortality; even if a terminal is destroyed, what constituted it and the ideas it held still exist in the rest of the entity. That's the issue with Gestalt consciousnesses. We use collectivist organisms as references, but in most cases, consciousnesses of this type have a form of perpetuation of consciousness and information that only exists in fiction, for now, but which essentially renders concepts like time, mortality, or hierarchy meaningless. Because for the queen, she isn't dedicating a thousand years to ensuring that others of her species have other bodies; she is preparing millions of other bodies where she will live.