I hope I've given him (and others) some things to chew on. Time-binding, for one thing, got Korzybski started. Trying to figure it out led him to develop his subsequent work.
Aside from its relevance to understand what Korzybski was doing, what (as J. asked) "authorizes this particular description over all the other potential descriptions of 'what dominantly characterizes humans'?"
Korzybski felt (and I agree) that this capacity to build upon what others have done—based upon our uniquely symbolic brains—does most characterize humans. If that at least seems plausible then we can proceed to see what develops from it. Fruitfulness 'is all'. What develops from starting to think of yourself as a time-binder? Let's extensionalize this, bring it down to earth.
As an exercise, I suggest contemplating one or more of these time-binding questions:
* Can you find anything that you have made, arranged, organized, composed, written, etc., that didn't in some way depend upon the contributions of others?These questions can help you get a feel for yourself as a time-binder. What kind of difference could becoming more consciously aware of yourself as a time-binder make in your life?
* Take an object from your pocket, desktop, or around your house or office. How did it get here? How was it manufactured? Trace things back a bit. How many people were involved in making it and getting it to the store or place where you bought it or got it from? Who invented it? What other inventions were required to produce it? Et cetera.
* How did you come to be reading this weblog?