I am confident saying Lie-Nielsen's claim that their chisels and planes are ready to use out of the box might not be very accurate. /quote]
I don't know about LN chisels but, all I have ever had to do to a Lie Nielsen plane is examine it first off, then put the secondary bevel on the iron. I don't use David Cs ruler trick. I just flatten the first 1/2 inch or so of the face, by hanging the iron over the edge of the stone. That's all that's necessary. You're looking just for enough flatness to support the cap-iron and get it closed up near to the edge to avoid tear-out. (If you doubt that, check out Richard McGuire on YouTube with regard to tear out. Few do nicer work than Richard. )
The majority of the face is hidden by the cap-iron anyway. Subsequent sharpening advances the flattening as you go, just like the copes in a Japanese chisel. I'd sooner put work into my projects than into unecessary targets for my tools. That's how I saw my Grandfather's work, and there was nothing wrong with that I can assure you. As a self-employed wood-turner, and furniture maker, during the Edwardian era, he didn't have time to make a shaving mirror out of the back of a plane iron! Well okay, he might have done, but seriously I doubt it.
John (hammer)