No, not at all. Things have been looming just under our noses for hundreds, or even thousands of years, although, in principle, they should have been obvious to anybody from the time of the invention of dirt - just remember the Sandwich, or the steam engine. The Zeppelin bend is just like this. However, if one looks closer, he can “see” the reasons that had postponed its discovery for so long : It is the only bend where the standing part s first curve of the one link is not 'hooked" around the standing part of the other link, as it would have been “natural” to expect for a bend - but only around the pair of tails, that work as the pivots of a rope-made hinge. Big, huge difference !
Ancient Egyptians were building pyramids for 1700 years before somebody told them that they can measure how tall those man-made mountains are by measuring the length of their shadow on the sand… Ancient people all over the globe were building ships for thousands of years before somebody, in his Eureka moment, told them that " the upward buoyant force exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces , so " Any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object". Elementary, my dear Archimedes ! 
The Zeppelin bend should have been a tricky bend to discover in the first place - and it is still a much more complex knot to understand than to tie ! Its deceiving formal simplicity, which conceals its structural Eureka moment, is what makes its so late discovery seem a bit strange. The fact that it was not invented before, say 1765 ( Watt s steam engine ), is it a strange thing ? When exactly its discovery should have been taken place, in order to seem “natural” to us ? And who can bet that an ancient Egyptian or Heraklas, had not tied it 4000 or 2000 years ago ? When one looks at the Megalithic Temples of Malta, the Stonehenge, the Pyramids, or the Pantheon, and at a Zeppelin bend, which would seem a more complex thing to him ?
Imagine that the Zeppelin bend was not known today - as it was not known until some point in human history - was this point the time of Heraklas, of Graf Zeppelin, of Rosenthal or of Ashley. It would nt be such an obvious knot to consider, that is for sure. That tells me that there may be yet other still unknown knots, which, AFTER their discovery, would also seem “simple” to us as the Zeppelin bend does NOW , and their late discovery would also seem “a bit strange” - but they are still untied and untried, perhaps because they, too, are based on a yet another novel and unexpectedly effective knotting principle, as the rope - made hinge was.
Archimedes text s" On Floating Bodies" , The Method of Mechanical Theorems" and Stomachion" were discovered in 1906, 2150 years after they were written ! (1) Who knows when the first text or picture of the Zeppelin bend will be unearthed - but, most probably, my life s line would not remain “over” the earth for so long !
- http://en.wikipedia.org/wiki/Archimedes_Palimpsest
??? 