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You are simply comparing grens and penals dps, received accuracy would change the actual dps against those specific targets.
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As requested:
SU going T1 means suppression advantage for OH for at least early game (say vet 0-1). ...
Are you referring that going T1 for SO leaves them without HMGs? Because I don't see how suppression is relevant. If so try to keep in mind that this is about improving the design and not the balance.