Imho, we really could use some more versatility. Since SM tacticools can have plasma rifles, meltas or stalkers, why not give Dire Avengers the option between picking from Rifle, Twin-Linked or Power Sword + Pistol? The power sword + pistol won't break the game, but it would add some much needed versatility. It's still not a dedicated melee class, considering that it has neither Banshee's scream nor Scorpion's stealth (+mandiblasters+armor+toughness) - Thus, leaving it at a disadvantage compared to shieldbros/JPA. As for sergeants, aka. Exarchs, yes. They should have access to Power sword + shimmershield combo or Diresword for full on damage spec. I mean, this all would only add to asymmetrical balance, make each faction unique. Also, give Swooping Hawks the option to pick a sword instead of a rifle, and don't give them any silly hulk-smash-down-to-earth. I don't understand your argument at all. Orks have heavier weapons, same as chaos, and chaos has access to unique marks etc. Asymmetrical balance and versatility.
I would really love it if the base avengers could get Sword/Pistol combo. I would also love to see them give a plasma style weapon to the Fire Dragons, we use plasma pistols and cannons but don't have a mid range plasma weapon, seems weird, but definately don't give plasma to the Dire Avengers because the Specialization of the Shrines needs to be maintained. I honestly really hope the game takes off so I can play as the Pointy Eldar eventually