Why, in the movie, does Grievous still have a bunch of internal organs?

Why does Grievous still have a bunch of internal organs?

Why does Grievous still have a bunch of internal organs?

WHY? DOES? GRIEVOUS? STILL? HAVE? A? BUNCH? OF? INTERNAL? ORGANS???

Transcript

Padmé: Punch him in the actuators!
[SFX]: 16!
[SFX]: Wham!
Obi-Wan: Owww!!!
GM: Your blow knocks Grievous's breastplate loose.
Obi-Wan: Hmmm. What's he hiding behind there?
[SFX]: Riiip!
GM: You see an atrophied, beating heart.
Obi-Wan: Why, in a cybernetic body, have you kept your heart?
General Grievous: Without a heart, how am I to feel love?
Obi-Wan: Love? That's more human than I imagined you to be.
General Grievous: Without love, how am I to feel hate?
Obi-Wan: Okay... well... I guess that makes a modicum of sense.
General Grievous: And without hate, how am I to know the exquisite sensation of mild annoyance?