As said above Uma cannot accomplish even the simplest of tasks, being her husbando would be akin to looking after a retarded child.
Also she is too stupid and innocent to have sexual thoughts, well done on everyone in japan having seen your waifus vagina while you don't even get to hit it. I would imagine that talking her into having sex would be of a difficulty on par of explaining anal to shirou, and having him understand why some people want to do it.
I'll stick with Aiko, cooks, cleans, repairs broken devices, intelligent, conversational. Also, glasses AND maid outfit, how much more win do you want?
she's too good for /a/ anyway, you faggots would probably break her by attempting to install a mac O/S...