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Also for that matter mechanical hands are pretty damn flexible and accurate. There was a scene in Infinite and Divine where a techpriest that was being taken over by Orikan and made to lie prone, but because his mechancal hand was able to bend backwards even while his arm was splayed out in prostration at him, he just titled the pistol in his hand backward and shot himself so he wouldn't be a pawn.
This could present some very interesting shootout scenes where a space marine or Talos with a pistol can extend his arm aiming forward but literally be able to fire in almost any direction, even tilting his hand backward to fire over his shoulder, perhaps surprise killing a foe who thinks they are sneaking up on their back.
Which can be further augmented by eyes/servo skulls watching the back, giving them 360 field of vision.
Think not our acillians limited by the fragile/weak flesh of mortals!
Theoretically we don't have to shape them like traditional hands either, maybe make them even more efficient than normal human hand shapes. More and longer fingers and joints perhaps.