I find most instructions for everything to be less than adequate. I believe that they are re-written from the original Chinese by people who have no technical experience, have never seen the product, and don't give a toss.
It is bad enough when the end user is someone who like, I would guess most people on these fora, is fairly technically literate and can work things out for themselves. Imagine the problems that can occur when you are selling to the "technically challenged".
As an agent selling Chinese made goods in the UK for an Italian company I learnt a long time ago that it saves much time and effort in the long run if I re-write the instructions on every product so that they are as "idiot proof" as I can make them. When I first started doing this the Italians said "you are wasting your time - no one reads instructions anyway..."