That`s because non-phalanx infantry units with 2 melee weapons tend to switch to secondary arm durin melee. Thus hypaspistai were fighting mostly with spears and Thorakitai with ap swords. No wonder, that Th. hoplitai won. The above mechanics makes all sword@spear infantry (mainly elites) much weaker than it should be. They receive cavalry charges with swords, and melee other infantry with spears - exact opposite of what they should have been doing.
Spear as primary and sword as secondary works pretty well for the very same reasons.
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