Geez, you mainline pures have some odd ideas about us modified humans. Damn near a superstitious fear. We are not "alien", though the oppressive fear of us is a bit alienating. :p Seriously, there are straight up, fully organic "humans" out there in the real world that scare me far more than some dude with a non-organic frame. Sociopaths are most def where to really look for the "alien", but sadly and terrifyingly they look just like mainline pure organic humans.
That said I can't speak for the inorganic brain in wetware infrastructure (cool idea by the way and yep that seems to fly under the BMI rule :D), that may indeed be bit "alien", but I suppose it depends on the coding. Might be a better human than us organics, it is amazing how an emulation run over years and then decades becomes real.
Now as to the cybernetic parts and thier function they are rather low power just like organic parts, have a user serviceable battery, and should last for a year at standard wear and tear. They also make use of the same biomechanics that organics use, just with non-organic bits. And the weapons are removable as they have to be maintained and cleaned after use so they have to be removable. Weapons aren't magic kids, they require care to function properly and that means taking them apart regularly. That means they can be removed to comply with local laws or the possessor can face the local penalties (provided they don't have some form of immunity like being a Noble, Ambassador, etc. or having a Warrant).
Hell, the base parts have to be removed to be serviced so really, ya'll freaking out for no damned reason. Sadly pretty common from the folks who don't have to cyborg maintenance all the damned time. Also, if you are really feeling mean, in addition to the regular maintenance we have to do, check to see if their insurance (if they even have that, TAS counts) covers their cybernetic maintenance, I know I am paying out of pocket for mine and have been since I was in my twenties.
And last, the kinda Timmiis that go for über cyborg body mods are those who didn't pay attention to the number of episodes Steve is in the bay doing...yep, cyborg maintenance with the Doc. You want a nice low down on the "joys" of cyberization check out Shirow's Appleseed manga, not the videos thought cool, read the volumes of coolness and pages of cyborg maintenance. Also proves getting shot with good cybernetics is still being shot and not fun for the not-crazy people.
Now, about this telepathic "creepy bastard" apply this same logic and figure most are decent people who really don't want to listen to your secret, naughty, inner thoughts, we have them too. :)