Because they are at ober level when they have brens. Putting them over ober level is probably just too much. Its not like theyre only slightly better than tommies, and its not like I actually suggested putting their rifle + bren performance worse than their current sten + bren performance.
Don't Obers already have much better DPS through vet? I mean yea they seem equal with double bren vs MG34 stock.
but when ober hit vet 2+ commandos just bleed like stuck pigs. If commandos are going to have a long range focus with different weapon stats then make it a completely separate unit with separate vet to sten camo commandos. No use having the current vet suited around stens and ambush (smoke on retreat) if you are going to give them rifles.
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Or you could do the 180 turn around option and make regular commandos the elite Para/Obers type unit with long range DPS, while making brens a non fuel and MP upgrade for them (so double bren upgrade button for 90muni etc instead of currently having to pay fuel,mp and 90muni at HQ). Also buffing vet and removing camo to match those two units.
Inf commandos could keep the sneak stealth camo role, stealth stens and current vet. This is a better option in my opinion and makes more sense.