These are 'Hacker-friendly' pens. With most pens the nib and feed are glued in, but in the Noodlers pens they are push fit, so can be adjusted. You can adjust the amount of flex and flow independently.
You can also take out the entire filling mechanism, and use the whole pen body as a reservoir. Neat.
http://www.fountainpennetwork.com/forum/topic/209380-noodler...
2. Vim
It was a bold design concept to use 'modes', but it makes it so much more productive.
Vim got modal editing from vi, which stole it from Bravo...in 1976.
And actually, the "insert" mode was the innovation - previous editors were completely command-driven, being designed for use on teletype machines, where you could not have a usable "edit/append" mode.
https://en.wikipedia.org/wiki/Vi https://en.wikipedia.org/wiki/Bravo_(software)
The Noodler's also have the feed made of cutable ebonite instead of cheaper plastic, so you can carve out a deeper ink channel if you want.
You can still adjust the flow of the nib without tampering with the feed by just using a brass strip and running it through the slit in the nib (to increase the flow). I have never wanted to decrease the flow of a nib unit.
What you are saying is true though. Ebonite feeds have their advantages, like you can heat tune them as well to fit to a certain nib shape.