[jacobolus]

I’m not “ignoring” anything.

All fine hand control (fencing, kitchen knife work, writing, eating with chopsticks, soldering, knitting, playing a piano, ...) uses a combination of whole-forearm motion, wrist motion, and finger motion. The human brain/body are incredibly good at translating intended action into precisely choreographed movements combining multiple muscles. The question is how much of each type of motion to use; the more the work can be offloaded to the whole arm, and the more relaxed the wrist and fingers are, the more comfortable it is to do something for a long period of time. The fingers still do quite a bit of fine motion, regardless.

But my comment doesn’t even advocate any particular grip or hand movement technique; all I said is that those bits of advice from the Palmer school, under discussion by the top-of-thread poster, are applicable across various letter-shape styles. As far as I can tell that’s a completely uncontroversial statement.

[Retric]

There is a wide range of comfortable shapes people can make using whole hand motions, but arms have a vastly more momentum than the tip of a pen. So for example the center of an uppercase E is much harder to do using whole hand motions if you need to stop your arm motion in the middle to add details. It can be a fairly direct tradeoff between legibility and readability. Scripts that are less legible because they lack detail can quite simply be far easier to pull off.