On the contrary, writing is key to organizing and clarifying one's thoughts. It is an essential part of learning.

"Writing is nature’s way of letting you know how sloppy your thinking is." -- Guindon

People write a lot of stuff that is not for homework. Maybe they should make a measurement of something else they write. I would even say that writing for homework is a special skill in bullshitting that does not (cannot) exist in other forms of writing.

> ...is a skill that is in practice purely developed in order to do homework.

I would argue that it helps kids learn how to organize and formulate coherent thoughts and communicate with others. I'm sure it helps them do homework, too.

An Asimov fan saying writing long texts is stupid? I bet he would have some strong feelings against that

An asimov novel is not a homework, i explicitly referred to homeworks. People write a lot of stuff other than homework.

Well yeah, he was probably getting paid by the word :)