drawing people "properly" - important?

[kissingfrogs]

dd2s teacher mentioned something about the importance of drawing people properly (head, body, arms, legs).
Dd2 (4.8) always draws people as a head with legs & arms, she just doesn't "get" the body thing even though I've spent time encouraging her.
Is there some sort of developmental relevance to "proper" drawing of people? Surely it's just a childish thing to draw as you please?

I'm not sure it's a predictor of intelligence; more of drawing ability.

I can think of many academic and intelligent people who draw poorly as adults.