It's got ephebophilia with tones of pedophilia! Your complexes aren't just Oedipal but Electral, too! Age gaps so huge half the characters could be their coupling's parent! Oh, the romance!
I'm sure there's already a dissertation out there about the creepy aspects of Chobits, because CLAMP never had the scruples to avoid the taboo topics. They paired together a teacher and elementary school student together in Cardcaptor Sakura, for God's sake! These women don't know when to stop, and for that, I almost... admire them? Like, damn, CLAMP never got told "no" in the making of any of their stories, if the content is anything to go by.
Chobits creeped me out. The blurring the line between Chi being like a baby to being like a toddler to looking, at most, like a "15- to 16-year old", to Hideki's both paternal and romantic feelings toward his robot slave-daughter-girlfriend, to Freya's whole "romance" arc, to the pair with the twenty-year age gap (and one still in high school), to the adultery and the constant reminder that people in this world are fucking their robots... All of it is disconcerting, even when it's meant to be titillating (such as in the uncomfortable cases of Chi) or thought-provoking.
It's almost sexist in its portrayal of men, especially during the hilarious finale and its staggering implications:
Hideki comes to the conclusion that he's okay not having sex with the robot-daughter-servant-girlfriend he wants to have sex with because he loves her for who she is. He doesn't want to have sex with her, and therefore he loves her... he loves her, therefore he wants to have sex with her. Since that love comes first, it's very sweet. But, like... bro. Why is this portrayed as a big deal? This is the bare minimum for a relationship, but in this manga, "actually, I love her, and not just in a horny way," is meant to be the jaw-dropping reveal (aside from the "you can't fuck her because her reset button is in her gooch lol" reveal). CLAMP must think lowly of men if "I love her, therefore I want to have sex with her, as opposed to wanting to have sex with her and loving her for that reason," somehow clocks in as heartwarming to them and not, just... you know, what men feel, because men are humans. Wait, wasn't this whole manga about being human? Either way, Chobits's heartfelt finale comes at you with every woman's deepest desire: the bare minimum.
A lot of the writing in this manga made my head hurt. Not with complexity, but the inverse -- the meandering simplicity and the unremitting repetition wore me down as I binged the story. An allegorical children's book parallels and alludes to the concurrent story of Hideki and Chi with the plain language one would expect in a book aimed at toddlers. But its scenes go on for so long, rehashing the same lines with insipid language over and over again, in a way that I can only call boggling.
I think silencer hit the nail on the head with their 2009 review of Chobits here on Baka-Updates: "Overall, a mediocre manga, and i can't see how it is categorized as Seinen. Practically, aside from the ecchi part, the story is suitable for readers under 13." Chobits is wish fulfillment for men that want to fuck inexperienced, virginal young women. If you're outside that demographic or over the age of, say, 12, this won't be for you. Younger audiences shouldn't read it because of its adult content, either.
If its "philosophy" is anything to go by, there is nothing adult or profound about Chobits, unless this is literally your first time reading any sort of "can robots Feel and can we love them back?" story. Art's gorgeous, though. That's CLAMP for ya.