Several times I have seen this advice (or words to this effect): "Never use
\\ to break lines outside special contexts such as tabular." (for example, Pass a 's' (star) parameter to a macro). I cannot find a source for this advice.
Indeed, "The LaTeX Companion" (page 104) has this:
"Other ways of typesetting paragraphs are flush right and centered, with the
centerenvironments, respectively. In these cases the line breaks are usually indicated with the
\\command, whereas for ragged-right text (the
flushleftenvironment discussed above) you can let LaTeX do the line breaking itself (if you are happy with the resulting quality)."
Moreover, instances of the use of
\\ to format paragraphs are legion. Why is this use of