I get dates for your sister.
There's a lot of 'cheats' involved in getting the characters to 'look right' when they're in up-shots or down-shots, & a lot of them are. Or when the composition is extremely tricky, & there's a certain 'look' a director wants. All of that HAS to be done by hand. A CG created character wouldn't be able to cheat those things. Well, it could, but it would take many more hours to manipulate it than to just draw it by hand in 1/2 the time.
A lot of robots & vehicles are 1st laid out by hand, & then scanned in the PCs for reference. So a lot of that CG stuff you see was 1st drawn by hand, then computerized. (Not ALL of it, though.)
Remember Homer3 when he was rendered in 3D in that THOH episode? Well, would you think Fry & the gang would be able to get their funny facial expressions & stuff if they were rendered like that? No, they'd look like plastic dolls, just like Homer & Bart did. It's a cool look, & I like it, but that's not how the show was meant to look in the 1st place.