Thanks to the "foreboding" last line in the ENT episode it set up that the events of First Contact were a pre-destination paradox, that the Borg and the E-E crew had always gone back in time to the flight of the Phoenix so that the Borg would learn of humans and understand the importance they seemingly are to the Collective.
That's the problem with this. If the Borg are supposed to have been always like this because of the pogo paradox mentioned in "Relativity", there is apparently no way that the TNG episodes happened the way we have seen them storywise.
It would have been better to have been explained as a simple change in history because of the Borg travelling back in time without being predestined.
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