The last command set enables easy switching between one- and two-sided versions of the document (with corresponding offset of the text block) by changing only oneside (or twoside ) option of the \documentclass command. In both versions the width of the text block stays exactly the same and thefore there is no need to re-check the typesetting result which is usually the case because despite good
default typesetting quality produced by LaTeX,
long documents often require additional manual
tuning such as removal of widow/orphan lines or
re-location of figures after switching layouts. Using the described approach, there is still possible a situation when the text lines can appear in the compiled document differently for oneside and twoside options, namely in case of using page numbers in the text (., "...for the detailed explanation see page 123..."). This can occur because of additional empty pages at the beginning of a chapter in two-sided layout. But it can be avoided referring to the particular section of a document (., "...for the detailed explanation see Section ...") the rather than to the page numbers directly.