The general attitude of writers and printers may be summed up by saying that you must justify the use of a punctuation mark, particularly a comma, rather than its omission.
But why should the printer bother himself about punctuation at all?
Is that not the business of the author, the editor, and the proofreader?
Strictly speaking, yes, but authors generally neglect punctuation, copy is not usually carefully edited before going to the compositor, and proofreader's corrections are expensive.

It is therefore important that the compositor should be intelligent about punctuation, whether he works in a large or a small office.
The question of how far the printer may go in changing or supplying the punctuation of copy will depend largely on circumstances.

If the condition of the manuscript is such as to show that the author really intended to put a fully punctuated, correctly spelled, and properly capitalized manuscript into the hands of the printer, he has a right to have his wishes respected even if his ideas are not those which prevail in the office.

In such a case the compositor should follow copy literally.

If any questions are to be raised they should be discussed by the proofreader _with the author_.