Batteries are heavy, they’re inside your torso, if it doesn’t encumber because it’s inside, it still weighs something, it’s still something your spine must support.
Carbon nanotubes is still armour underneath your skin, no matter how fancy it is, you’ll at least feel that slightly when moving.
The air filtration system provides more for air to go through before it hits your bloodstream, at least 1 mouth encumbrance. where obviously a dust or gas mask would still give far more encumbrance, so it’s still beneficial, make sense?
Let’s say the cranial flashlight, that’s going to be something that can be smashed and should slightly lower head hp.
Think about how much space the CBM item takes up and how much it weighs, you’ve got your answer
It should be a question, do I want to become more than human?
This is part of the humanity you sacrifice when becoming that.
Small downsides, where the positives still outweigh the negatives, after all, they are bionic enhancements, but they do still exist, much like mutations.
Obviously the military grade, fancier, less encumbering, higher tech stuff has less downsides, but again, they’re still adding mass to your body regardless of high tech they are.
When bionics are not powered, they are still inert hunks of plastic, metal, silicone no mater how much fancy ‘superalloys’ you use.