That is the second explanation I considered, and I agree that it actually would make a lot of sense to balance units according to their historical performance rather than just to what armour they are wearing.
But Ludens' explanation seems to contradict this, stating that the team uses a formula, with some few exceptions. Perhaps Hastati indeed are one such exception.
(Though in that case I would still wonder at post-Marian legionaries being weaker than Polybian legionaries, if anything I was under the distinct impression that the professionalisation of the Roman Army increased its fighting potential rather than decreased.)
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