[dvdkhlng]

The problem is, if you write by hand and you start writing really fast, you will distort the image. As long as you use the common stroke order, that distorsion will stay readable as it is a distorsion that people are familiar with. Use the wrong stroke order, and your letters will become undreadable at high writing speed.

I'd assume this is the reason why japanese calligraphy [1] is still readible to the skilled reader albeit the images having no obvious resemblance to the original characters

[1] https://en.wikipedia.org/wiki/Japanese_calligraphy