I wasn't vaping when the "original" Dekang RY4 formula was available, so I have no personal experience in memory of what that juice tasted like. I do have some thoughts related to it, however.
Running throughout this thread is a supposition---at times supported but just as often ignored---that Dekang's "original" and now mythic RY4 is the Gold Standard against which all present and future RY4s should be judged. Here's the question I would pose to all of us who follow this thread: Is that true? Is the "best" RY4 the one that recreates or most closely approximates that "original" RY4?
On one side is the idea of standards. Few people would disagree that standards are important, whether as basic values or as measurement benchmarks. Tradition recognizes the importance of standards and their maintenance. It's the difference between "real money" and "counterfeit money" (but don't get me started on THAT one, given what the banksters have done to us over the past century). True conservatives hold that real standards are permanent and unchanging. Truth, Apple Pie, Motherhood, The Family---these are to many sacred standards for assessing moral/ethical and even pragmatic goodness. By having an absolute standard, one can make accurate judgments about the relative worth of different things.
Can you just slap together any concoction of flavors you want and call it RY4? Well, no, not really. Or maybe you can, but if your RY4 is composed of lemongrass, burnt apple, and bacon flavors, people will almost certainly react by saying, "What the hell is that? It's sure not RY4!"
So, on this first side of the argument, wv2win's post asserting that the now-lost original Dekang RY4 had no nut flavor at all is both significant and meaningful. He is functioning as a true conservative, reminding us of the "timeless" standards and absolute values that make RY4 what it is (and perhaps, depending on one's temperament, what it "should" be).
On the other side, however, consider almost any organized endeavor you know---from NCAA football to Modern Dance to Theoretical Physics. Do the rules and standards---however sacred they may be to some people---remain the same over time? No, they don't. The NCAA and NFL (or NBA and MLB) routinely change the rules of their sports (literally every year). Football now bears little resemblance to the gridiron of Red Grange or even Johny Unitas. For two centuries, Ballet was locked in as the only "acceptable" art-form of high-culture dance (folk dances were considered low-brow), until rebels such as Isadora Duncan and Mary Wigman came along in the early 20th century to blow that class-based, stuffy presumption out of the water. Many varieties and approaches are now considered perfectly valid in the art of bodily movement, yet all fall under the heading of Dance. Newtonian physics was the end-all, be-all understanding in science of how our universe is assembled and works, until Einstein, Planck, et al, came along with quantum mechanics to say, "Uh, wait a minute, folks..."
At this level of the argument, who cares what the original RY4 tasted like? It's gone. And even if it weren't, a thriving and expanding marketplace is bending, reshaping, and pushing out the limits to what an RY4 is or could be---refining, improving, and re-defining---based on sales and customer feedback. If you create a better RY4, will the world not beat a path to your door? In the tenets of small-business capitalism, you betcha.
But Bill, doesn't the very name "RY4" refer back to the ultimate standard of Dekang's Ruyan #4? Well, sure, but RY4 is now used in much the same way that people use the term "kleenex" to refer to any brand of facial tissue, or "Coke" to refer to all fizzy cola soft drinks. I don't know if the brand name "RY4" was trademarked by Dekang, but even if it was, in this marketplace that trademark is meaningless, since it's impossible to enforce.
So, in the counter-argument, RY4 becomes whatever the marketplace says it is---whatever WE say it is. Period. End of story. If wv2win asserts that RY4 should have no nuttiness, but I like RY4s that do, then we are simply in competition about either maintaining classic standards or revising them to suit changing tastes in an evolving marketplace. Inevitably, however, the standards will change over time, however much that is bemoaned by some as diluting or perverting our values.
As to which stance is "correct," I haven't a clue and would feel silly to pronounce one right and the other wrong.
I do happen to feel that the world is big enough to allow both points of view, despite their seeming contradiction. In fact, reality needs both perspectives. That's the Yin/Yang of the Tao.