Switch System

[Bluetoes101]

Would that not contradict a carefree flowy style where they do not have to stop and think?

I don't really have any input for spelling of words, but the words are structured and the structure is predictable and to some degree mappable. 
The writer may not have been sure if the next letter should be "a" or "y" for example, but once that letter was on the paper the choices for the next character are set.

If they choose "a" the choices are i, n, r, j, m, l

If they choose "y" the choices are t, k, p, f, d, q

If you then add in some knowledge from LAFFU/Slot system etc the choices become even further reduced. 

For example lets say it is the 3rd line, in the middle of a paragraph and the choice is "y". 
P+F are out. Lets say it is in the middle of a word and we already had a gallows character, now q, k, t are also out. 

The next letter can only be "d" (or the word ended).

This is a "perfect world" sort of example and the text sometimes doesn't follow this, 7% (non-conformance) is still a rather large number so it is not exact. But I guess the point is that in my opinion the text was cornered in this example, and much of it is to one degree or another cornered. 

The why of it I guess is the interesting part, and on that I have no clue.