While I agree that he rid himself of most emotion, Vader was not this way because of his technology. Before most of his body was destroyed, he killed countless Jedi and other people. He did care for Luke though, so he hadn't completely ditched his emotions.

And as for how he goes to the bathroom, I agree with the idea that he has something in his suit that stores it until it needs to be emptied.

That's hilarious, I've thought the same thing, I honestly have no clue, maybe the emperor had the imperials build a special bathroom that had the same technology that the black dome thing had, where he could take of his mask, but then that begs the question why build a big bathroom with the same tech as that small chamber, and not build living quarters with the same tech?....Excuse me I'm ranting

well good for you but i still think your wrong. you said "it will be impossible to eliminate waste disposal in our systems unless we are almost entirely cybernetic (Separatist General)" well ummm.... im pretty sure darth vader is almost entirely cybernetic. and even if he isnt, who sais that they havnt replaced his inerds with machine parts like the Sparatist General has. we dont know what is under that suit. no one does. I feel that there might not be a right or wrong answer here.

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he has a little trap door where he opens when he has to 'go'. he uses the bathroom... then closes the trap door and leaves.

You stupidly relate the two. G.G. is almost entirely cybernetic. Darth Vader is not. Darth Vader maybe short most of his limbs, but he still had for the most part a gasping - yet working, body. Complete with a head, and uninterrupted torso, a waist, and his pelvis. He did live long enough, in terrible conditions and in unimagineable turmoil for the Emperor to arrive, so his body was still functional. So do not present me this crap, "Darth Vader was almost entirely cybernetic'' Being a cyborg does not necessarily mean you are almost exclusively a machine.

1. Limbs
2. 0cular implants
3. Cardiac assistance

These are his major additions, l guess. Perhaps more. But as you can see they exclude the important body parts listed prior to. Hence, he Darth Vader can pass as human still, far easier than GG anyways....