Making references

>making references
>using allegories and symbols

Why do people do this? Why not just say it how you mean it? Why is it not the highest form of art to write something that is as complete in itself as possible?

Because we're part of a super secret club and YOU aren't invited!!!

That's exactly how it is. Problem is that the people who write like that don't realize that nobody even wants to join their super secret club.

Then write like that

I am. I was just wondering where the overboarding abuse is coming from.

Because it helps you to understand what you are talking about. That IS saying how you mean it. Sometimes comparing it to something else just communicates the idea better.

because a word is concrete
that locks the mind into one single thought

an allegory, a reference, a symbol is so much more deep than just a word.
These literary devices are seeds that are planted in the mind, and at full comprehension bloom into a multifoliate cascade of ideas and feelings.
but I have a book you if you don't like that stuff.

I don't think it's bad to explain an abstract situation in different words to make it clearer. What i dislike is when they bluntly refer to something that, depending on wheter you know it or not, will make or break your understanding of the whole scene.
Just as an example:
Jack closely resembled markus.
Yeah, ok. That is very helpful if you know what markus looks like, otherwise it's just confusing. Especially if later on they build upon their expectation to now know what jack looks like.
Or, his hair looked like whipped nutella. No, his hair was dark brown, full and wavy.
Those are very broken down examples, the better the work you're reading, the more complex the allegories and references get, but i still don't get why they try to confuse their readers on purpose. Is it to appear mysterious and leave the reader thinking that they are somehow too stupid to "get" their work? What do they gain from it? That people on this board can boast about "getting" someone when in fact they aren't really sure they did?
Is it really just an "we're an elusive circle and you're not in" thing?

People like feeling smart, understanding a reference or an inside jokes make them enjoy the book more and read more from the author. It's a good business strategy.

What book?