Allies chart was for selling models, principally, and reducing the suffering of old codex armies, secondarily.
I think, and hope, that we will see a continuation of the introduced weaknesses of the previous codex for the nids, the hyperactive metabolism and inability to fight protracted wars for the newly awakened hive fleets. Basically if something can hold them back and deny them sufficient nutrition, the tyranids, weakened from the hybernation of space travel, begin to burn up their energies, heightened by their desperation to evolve better killing forms, and suffer a 'colony collapse'.
This, along with the 'individualism' of the rewritten necrons was entirely intentional, btw, by the design team, because it was deemed that both had come to overshadow the 'big bad' of Chaos, and Chaos is supposed to have the center stage as the greatest of all threats and has been since the creation of the games.
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