once a pawn has a bionic arm or leg installed the game removes their hands or feet preventing them from wearing gloves or boots, oddly enough it doesn't seem to have an impact on their manipulation or movement speed other than the part buff. Also, you cannot install bionic hands/feet on a person with bionic arms/legs.

as a side note i now have 3 melee pawns with bionic arms and legs, I can only imagine the horror a raider might experience in having these handless and footless half human half machine things come tottering up to them with swords fused to their limbs. Now that i think about it, i think i've killed things like that in resident evil somewhere.