Manalto

If manufacturers get too complicated and/or demanding in their instructions (and it doesn't take much for the average consumer to think "this is too complicated!") customers will shy away from the product. The old sewing machines that needed to be oiled were a case in point. The schematic in the user's manual gave critical oiling points, but not all of them. The reasoning was that too many oiling points would be viewed as an annoyance. (Singer repairmen made house calls in those days anyway. Can you imagine? House calls?)

I suspect the same is true with iron manufacturers; if they give the customer too many hoops to jump through, s/he will go elsewhere. Besides, if your iron clogs up, you have to buy another one. The manufacturer is gambling that you'll have brand loyalty.