Over the last 8 or 9 years since I have been collecting fountain pens, I have changed my viewpoint on flexible nibs at least several dozen times. At first, I had to have the wet-noodle because this was a coveted nib that only few had experienced. I have never found a nib that flexible, but I have purchased several pens with very flexible nibs. Over time the novelty wore off. I found I preferred a nib with a little spring to it, but the super-flexible nibs were just not convenient to write with.
Then I realized I was writing the wrong way. Instead of trying to produce width and shading with every letter, flexible nibs were meant to distribute ink with the lightest of light touches. If you look at correspondence from the 19th and early 20th centuries, people were not mashing down on the nibs getting them to bend into outrageous proportions, producing broad shades followed by razor point lines. This kind of activity was reserved for the professional penman who used a steel nib with a nib-holder to create a decorative business script. Break a steel nib, replace it with another one. They usually came in a box of 30.
So what is this obsession with the flexible nib? Why, when we see some demonstration of the pen are we automatically drawn to the flexible nib, when in fact, it doesn't represent the way anyone writes on a regular basis, nor should it represent the way the nib should be used.