Everything Drawabox teaches is at its core an exercise, and each exercise addresses an underlying concept or skill, developing it in the student. Applying the ghosting method, for example, teaches students to think and plan before they make a mark. Drawing from the shoulder teaches us to use our whole arm, for the situations where it is ultimately necessary to make the kind of mark we're wish to produce. Construction teaches us to think in 3D space, considering how the marks and forms we draw exist in three dimensions, rather than just as lines on a flat page.

How you draw on your own, and how any artist ultimately draws can only be considered correct or incorrect against the kinds of marks they're intending to draw. We refer to linework as chicken-scratch not just because it is made up of a lot of shorter segments, but because it is something a beginner will do precisely because they feel that they are incapable of drawing with a single smooth continuous stroke. If an artist is capable of doing it both ways, and chooses one, then there's nothing incorrect about it.

Drawabox ultimately forces you to learn how to do all the hard stuff, so you're able to draw with the freedom of choosing, rather than the restrictions of inability.

DaB insists on drawing from the shoulder because it's a good habit that brings consistent, good marks on the page. It also trains student to avoid the path of least resistance.

Masters have deep knowledge of basic techniques and that knowledge let them bend the "rules" or disregard them completely to achieve a desired result on the page.

Then it's not about right or wrong. It's about awareness. But we can always try to draw how we want during the 50% fun time. That is play time, so let's play! :)

By the way, that artist is great, I'll try to copy from him during the next session.

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OOhh this guy is one of my favorite Youtubers! I'm pretty sure alot of comicbook and manga artist draw like that. They're always going on and on about getting "energy" out of their lines and the best way to do that is through quick short strokes. Kinda of tough for me to describe or talk about since I'm an absolute novice but I've heard Jim Lee, Page One Comics and Doki Doki Drawing, talk about it, on their Youtube channels. I also think John Buscema mentions it in the video companion to "How to Draw the Marvel Way"

In reality there are no hard and fast rules of art, just a set of best practices that people agree in general make "good" art. My general approach is that deviations from the fundamentals (i.e. style/exaggeration) is valid as long as the artist is aware of and consciously choosing to break that specific rule. For example, an artist who uses chicken scratch because they are uncomfortable drawing from their arm is someone who I'd recommend relearning how to draw from the shoulder to be able to make long and smooth lines. But someone who isn't limited by technical skill/knowledge and chooses to break the rule to create a desired effect is perfectly fine. Yoshitomi is a clearly skilled artist in the fundamentals and chooses to draw that way, rather than it being the only way they know, but a beginner shouldn't take that as a sign to never learn how.

I wouldn't really consider those hairy lines, since his strokes appear to be confident. You can tell as he places the pencil down, the strokes are very energetic and swift. It's almost like drawing through your lines. It would be incorrect if the lines were more staggered and the person was an inexperienced artist.