I don't think we should harp on loli so much.
It is cute stuff (e.g like a cat) as opposed to perhaps big matured stuff (e.g cougar). Cats are popular with some people, cougars are also popular with other people.
On paper, the difference between loli, chibi, adult, are generally the size of the eyes, the breasts, and the body.
For a basic drawn figure, that is probably about 30 seconds of difference. Or none at all, I don't know, I am not an artist.