CONCEPT IS ALWAYS WRONG.
Yet isn't this, in itself, a concept? One that also contains the concept right vs. wrong.
Concepts serve a function. And while they are limited and, as what you seem to be saying, impossible to be 100% accurate, neither are they just 'wrong'. They serve a function and if you use that function skilfully it helps. If you define all concepts as wrong and refuse to accept any, that you are well, in your words, destroying the understanding of the inexpressible with the concept of "concept is always wrong".
I think we need to differentiate between reality, statement, and concept.
Reality is indescribable. Concept and statement are all simply the tool which refer to that indescribable.
All buddha dharma written in the Pali or Sankrit texts are simply instructions, statement or concept, which pin point to the reality, but not the reality itself since it is indescribable.
Concept is definitely useful. Not doubt about it. But it is pitty. Why? Because it is concept itself that bind us in samsara. We are like a magician who display a pretty woman and has a lust to that woman. We don't know that pretty woman is simply illusion, simply appearance, and not real.
All concept are wrong because concept cannot tell us reality. In order to prove it actually is quite simple. When we have a formula, that formula is only valid for certain condition. When that condition change, that formula is no longer valid. Our formula may not work in the ghost realm, or in the hell realm, or in the god realm. Reality is beyond all that. Concept, formula, or whatever it is, cannot describe reality.
The formula can be correct and useful. But it doesn't mean it is reality.
In the sky there is no North, East, West, and South. They exist because of a compass. Outside compass, they cannot be define. They exist relative to a compass. That is why they are called relative truth. But the ultimate truth is simply non-exist (empty).
Similar with a mass. A mass can exist only relative to its measurement. The ultimate truth (reality), you won't be able to find it outside its measurement device.
If it is reality, you will be able to find it anywhere, anytime, and with anything. But, where can we find such thing?
There is nothing wrong with concept as long as we know they actually only trying to describe certain phenomena, where that phenomena actually cannot be pin point.
When everything is constantly changing, we cannot pin point anything. If we cannot pin point anything, where is the real thing?
We can argue this until end of the world. To end this argument, we need to do a vipassana meditation. Because only throught that meditation, we can prove it or experience it for the first time whether we can things exist or not. I like to think that Vipassana meditation is actually the time where we are eating the orange. Not, intellectually thinking and writing a description about the taste of orange.
CONCEPT IS ALWAYS WRONG.
An important question is how does your understanding help you to relieve suffering? Do you say, well, the body is impermanent and always changing, so if your hands are cut off, it's just another change (not that I'm saying you should), or would you still be distressed, upset that you can no longer do some of your favorite things, you might not be able to keep your job, etc. (not that I'm saying you should be fine with it).
Whether you are upset or not, it depends on how deep is your understanding about emptiness. If that emptiness has 100% become our way of life, we won't feel anything when someone chop our hand. Why? Because since day one this hand is not yours! If we think someone chop the tree, we feel nothing. But, when someone chop this can, we extremely angry and feel the pain. All this is because we have the concept of "MINE". I don't say that if someone chop my hand, I will still be happy. I will feel very sad because my attachment is still there and emptiness is not my way of life yet.
If we see Buddha's life in the past, we can give his body for others. At that time, he still hasn't realize emptiness. But, he already can do it. If we can do it when we realize emptiness, there is no single sadness.
If I can borrow 2 quotes from Prajaparamitha Sutra, it mentions:
"Perceiving that all five skandhas are empty saves all beings from suffering."
"Because There is No Obstruction, He Has no Fear,"
It is this reality that free us from worry, scare, etc. Because since day one, actually there is nothing.
We are worry about death. But, how can we die? If you can die, how can you reborn?
We life with concept all the time. And we don't realize that concept, which comes from dualistic mind, is wrong. It is fine to live with concept as long as we know that concept it wrong. We won't scare with it or get cheated by it.
There is a real example about a monk in Vietnam (1963) who burn himself because he wanted to protest about the freedom on buddhist practice. He is really an enlightened being. You can see this video and his story in this link:http://www.youtube.com/watch?v=6Dal0X0aiQghttp://en.wikipedia.org/wiki/Thich_Quang_Duc
He is the person who has understand emptiness fully and that wisdom has become his way of life. When there is nothing since day one due to the reality of emptiness, how can the fear arise?
Similarly, there is no fear for a Buddha to go to the hell.
Things exist, but only exist as appearance.
Since they simply appear, they have no essence.
When there is no essence, why are we actually fearing about?????
In reality, whether we can achieve that level or not, that is a different story. But, that is the final realization that we are heading to.