@ Senpai - A girl being jealous of another's body is normal. Kanzashi does it as well.
@ Demi - Lolz
Well, some people are just born naturally effeminate. You have to take note that this has to go away at some point due to hormones.
Side note - Cause people complain, that's why. Besides, you said he replaces it with the Setsura cannon, which looks like a megaman ripoff. Lastly, is it really vital that he lose his hand? If not, it just looks pointless.